diff --git a/app/src/main/java/ua/acclorite/book_story/presentation/core/constants/Constants.kt b/app/src/main/java/ua/acclorite/book_story/presentation/core/constants/Constants.kt
index 437d3de4..56c73f53 100644
--- a/app/src/main/java/ua/acclorite/book_story/presentation/core/constants/Constants.kt
+++ b/app/src/main/java/ua/acclorite/book_story/presentation/core/constants/Constants.kt
@@ -440,7 +440,7 @@ private fun provideAboutBadges() = listOf(
 private fun provideFonts() = listOf(
     FontWithName(
         "default",
-        UIText.StringResource(R.string.default_font),
+        UIText.StringResource(R.string.default_string),
         FontFamily.Default
     ),
     FontWithName(
diff --git a/app/src/main/java/ua/acclorite/book_story/presentation/core/constants/DataStoreConstants.kt b/app/src/main/java/ua/acclorite/book_story/presentation/core/constants/DataStoreConstants.kt
index 1d9ba3a3..4ec4486c 100644
--- a/app/src/main/java/ua/acclorite/book_story/presentation/core/constants/DataStoreConstants.kt
+++ b/app/src/main/java/ua/acclorite/book_story/presentation/core/constants/DataStoreConstants.kt
@@ -39,6 +39,7 @@ object DataStoreConstants {
     val PERCEPTION_EXPANDER_THICKNESS = intPreferencesKey("perception_expander_thickness")
     val CHECK_FOR_TEXT_UPDATE = booleanPreferencesKey("check_for_text_update")
     val CHECK_FOR_TEXT_UPDATE_TOAST = booleanPreferencesKey("check_for_text_update_toast")
+    val SCREEN_ORIENTATION = stringPreferencesKey("screen_orientation")
 
     // Browse settings
     val BROWSE_FILES_STRUCTURE = stringPreferencesKey("browse_files_structure")
diff --git a/app/src/main/java/ua/acclorite/book_story/presentation/data/MainEvent.kt b/app/src/main/java/ua/acclorite/book_story/presentation/data/MainEvent.kt
index 343d306d..0f48b2af 100644
--- a/app/src/main/java/ua/acclorite/book_story/presentation/data/MainEvent.kt
+++ b/app/src/main/java/ua/acclorite/book_story/presentation/data/MainEvent.kt
@@ -42,4 +42,5 @@ sealed class MainEvent {
     data class OnChangePerceptionExpanderThickness(val thickness: Int) : MainEvent()
     data class OnChangeCheckForTextUpdate(val bool: Boolean) : MainEvent()
     data class OnChangeCheckForTextUpdateToast(val bool: Boolean) : MainEvent()
+    data class OnChangeScreenOrientation(val orientation: String) : MainEvent()
 }
\ No newline at end of file
diff --git a/app/src/main/java/ua/acclorite/book_story/presentation/data/MainState.kt b/app/src/main/java/ua/acclorite/book_story/presentation/data/MainState.kt
index 5e7b001a..8d2a6f22 100644
--- a/app/src/main/java/ua/acclorite/book_story/presentation/data/MainState.kt
+++ b/app/src/main/java/ua/acclorite/book_story/presentation/data/MainState.kt
@@ -16,7 +16,9 @@ import ua.acclorite.book_story.presentation.screens.settings.nested.browse.data.
 import ua.acclorite.book_story.presentation.screens.settings.nested.browse.data.toBrowseLayout
 import ua.acclorite.book_story.presentation.screens.settings.nested.browse.data.toBrowseSortOrder
 import ua.acclorite.book_story.presentation.screens.settings.nested.browse.data.toFilesStructure
+import ua.acclorite.book_story.presentation.screens.settings.nested.reader.data.ReaderScreenOrientation
 import ua.acclorite.book_story.presentation.screens.settings.nested.reader.data.ReaderTextAlignment
+import ua.acclorite.book_story.presentation.screens.settings.nested.reader.data.toReaderScreenOrientation
 import ua.acclorite.book_story.presentation.screens.settings.nested.reader.data.toTextAlignment
 import ua.acclorite.book_story.presentation.ui.DarkTheme
 import ua.acclorite.book_story.presentation.ui.PureDark
@@ -79,6 +81,9 @@ data class MainState(
     val perceptionExpanderThickness: Int = provideDefaultValue { 4 },
     val checkForTextUpdate: Boolean = provideDefaultValue { true },
     val checkForTextUpdateToast: Boolean = provideDefaultValue { true },
+    val screenOrientation: ReaderScreenOrientation = provideDefaultValue {
+        ReaderScreenOrientation.DEFAULT
+    },
 
     // Browse Settings
     val browseFilesStructure: BrowseFilesStructure = provideDefaultValue {
@@ -264,6 +269,10 @@ data class MainState(
                     checkForTextUpdateToast = provideValue(
                         CHECK_FOR_TEXT_UPDATE_TOAST
                     ) { checkForTextUpdateToast },
+
+                    screenOrientation = provideValue(
+                        SCREEN_ORIENTATION, convert = { toReaderScreenOrientation() }
+                    ) { screenOrientation },
                 )
             }
         }
diff --git a/app/src/main/java/ua/acclorite/book_story/presentation/data/MainViewModel.kt b/app/src/main/java/ua/acclorite/book_story/presentation/data/MainViewModel.kt
index a3930e94..2cc8b23e 100644
--- a/app/src/main/java/ua/acclorite/book_story/presentation/data/MainViewModel.kt
+++ b/app/src/main/java/ua/acclorite/book_story/presentation/data/MainViewModel.kt
@@ -23,6 +23,7 @@ import ua.acclorite.book_story.presentation.screens.settings.data.SettingsViewMo
 import ua.acclorite.book_story.presentation.screens.settings.nested.browse.data.toBrowseLayout
 import ua.acclorite.book_story.presentation.screens.settings.nested.browse.data.toBrowseSortOrder
 import ua.acclorite.book_story.presentation.screens.settings.nested.browse.data.toFilesStructure
+import ua.acclorite.book_story.presentation.screens.settings.nested.reader.data.toReaderScreenOrientation
 import ua.acclorite.book_story.presentation.screens.settings.nested.reader.data.toTextAlignment
 import ua.acclorite.book_story.presentation.ui.toDarkTheme
 import ua.acclorite.book_story.presentation.ui.toPureDark
@@ -530,6 +531,20 @@ class MainViewModel @Inject constructor(
                     }
                 }
             }
+
+            is MainEvent.OnChangeScreenOrientation -> {
+                viewModelScope.launch(Dispatchers.IO) {
+                    setDatastore.execute(
+                        DataStoreConstants.SCREEN_ORIENTATION,
+                        event.orientation
+                    )
+                    updateStateWithSavedHandle {
+                        it.copy(
+                            screenOrientation = event.orientation.toReaderScreenOrientation()
+                        )
+                    }
+                }
+            }
         }
     }
 
diff --git a/app/src/main/java/ua/acclorite/book_story/presentation/screens/reader/ReaderScreen.kt b/app/src/main/java/ua/acclorite/book_story/presentation/screens/reader/ReaderScreen.kt
index 89423194..f3cf614a 100644
--- a/app/src/main/java/ua/acclorite/book_story/presentation/screens/reader/ReaderScreen.kt
+++ b/app/src/main/java/ua/acclorite/book_story/presentation/screens/reader/ReaderScreen.kt
@@ -1,6 +1,7 @@
 package ua.acclorite.book_story.presentation.screens.reader
 
 import android.annotation.SuppressLint
+import android.content.pm.ActivityInfo
 import android.os.Build
 import android.view.WindowManager
 import androidx.activity.ComponentActivity
@@ -174,6 +175,12 @@ fun ReaderScreenRoot(screen: Screen.Reader) {
         }
         viewModel.onUpdateCurrentChapter()
     }
+    DisposableEffect(mainState.value.screenOrientation) {
+        context.requestedOrientation = mainState.value.screenOrientation.code
+        onDispose {
+            context.requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED
+        }
+    }
 
     ReaderScreen(lazyListState = lazyListState)
 
diff --git a/app/src/main/java/ua/acclorite/book_story/presentation/screens/reader/components/settings_bottom_sheet/ReaderSettingsBottomSheet.kt b/app/src/main/java/ua/acclorite/book_story/presentation/screens/reader/components/settings_bottom_sheet/ReaderSettingsBottomSheet.kt
index 71ac80a3..12768ed8 100644
--- a/app/src/main/java/ua/acclorite/book_story/presentation/screens/reader/components/settings_bottom_sheet/ReaderSettingsBottomSheet.kt
+++ b/app/src/main/java/ua/acclorite/book_story/presentation/screens/reader/components/settings_bottom_sheet/ReaderSettingsBottomSheet.kt
@@ -29,6 +29,7 @@ import ua.acclorite.book_story.presentation.screens.settings.nested.reader.compo
 import ua.acclorite.book_story.presentation.screens.settings.nested.reader.components.subcategories.MiscSubcategory
 import ua.acclorite.book_story.presentation.screens.settings.nested.reader.components.subcategories.PaddingSubcategory
 import ua.acclorite.book_story.presentation.screens.settings.nested.reader.components.subcategories.ReadingSpeedSubcategory
+import ua.acclorite.book_story.presentation.screens.settings.nested.reader.components.subcategories.SystemSubcategory
 import ua.acclorite.book_story.presentation.screens.settings.nested.reader.components.subcategories.TextSubcategory
 import ua.acclorite.book_story.presentation.screens.settings.nested.reader.components.subcategories.TranslatorSubcategory
 
@@ -94,6 +95,11 @@ fun ReaderSettingsBottomSheet() {
                             topPadding = 22.dp,
                             bottomPadding = 0.dp
                         )
+                        SystemSubcategory(
+                            titleColor = { MaterialTheme.colorScheme.onSurface },
+                            topPadding = 22.dp,
+                            bottomPadding = 0.dp
+                        )
                         ReadingSpeedSubcategory(
                             titleColor = { MaterialTheme.colorScheme.onSurface },
                             topPadding = 22.dp,
diff --git a/app/src/main/java/ua/acclorite/book_story/presentation/screens/settings/nested/reader/components/ReaderSettingsCategory.kt b/app/src/main/java/ua/acclorite/book_story/presentation/screens/settings/nested/reader/components/ReaderSettingsCategory.kt
index abfdc3c2..d66eafc0 100644
--- a/app/src/main/java/ua/acclorite/book_story/presentation/screens/settings/nested/reader/components/ReaderSettingsCategory.kt
+++ b/app/src/main/java/ua/acclorite/book_story/presentation/screens/settings/nested/reader/components/ReaderSettingsCategory.kt
@@ -13,6 +13,7 @@ import ua.acclorite.book_story.presentation.screens.settings.nested.reader.compo
 import ua.acclorite.book_story.presentation.screens.settings.nested.reader.components.subcategories.MiscSubcategory
 import ua.acclorite.book_story.presentation.screens.settings.nested.reader.components.subcategories.PaddingSubcategory
 import ua.acclorite.book_story.presentation.screens.settings.nested.reader.components.subcategories.ReadingSpeedSubcategory
+import ua.acclorite.book_story.presentation.screens.settings.nested.reader.components.subcategories.SystemSubcategory
 import ua.acclorite.book_story.presentation.screens.settings.nested.reader.components.subcategories.TextSubcategory
 import ua.acclorite.book_story.presentation.screens.settings.nested.reader.components.subcategories.TranslatorSubcategory
 
@@ -44,6 +45,11 @@ fun LazyListScope.ReaderSettingsCategory(
         topPadding = 22.dp,
         bottomPadding = 0.dp
     )
+    SystemSubcategory(
+        titleColor = titleColor,
+        topPadding = 22.dp,
+        bottomPadding = 0.dp
+    )
     ReadingSpeedSubcategory(
         titleColor = titleColor,
         topPadding = 22.dp,
diff --git a/app/src/main/java/ua/acclorite/book_story/presentation/screens/settings/nested/reader/components/settings/ScreenOrientationSetting.kt b/app/src/main/java/ua/acclorite/book_story/presentation/screens/settings/nested/reader/components/settings/ScreenOrientationSetting.kt
new file mode 100644
index 00000000..7d2a6aa3
--- /dev/null
+++ b/app/src/main/java/ua/acclorite/book_story/presentation/screens/settings/nested/reader/components/settings/ScreenOrientationSetting.kt
@@ -0,0 +1,47 @@
+package ua.acclorite.book_story.presentation.screens.settings.nested.reader.components.settings
+
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.res.stringResource
+import ua.acclorite.book_story.R
+import ua.acclorite.book_story.domain.model.ButtonItem
+import ua.acclorite.book_story.presentation.core.components.LocalMainViewModel
+import ua.acclorite.book_story.presentation.data.MainEvent
+import ua.acclorite.book_story.presentation.screens.settings.components.ChipsWithTitle
+import ua.acclorite.book_story.presentation.screens.settings.nested.reader.data.ReaderScreenOrientation
+
+/**
+ * Screen Orientation setting.
+ * Changes Reader's screen orientation.
+ */
+@Composable
+fun ScreenOrientationSetting() {
+    val state = LocalMainViewModel.current.state
+    val onMainEvent = LocalMainViewModel.current.onEvent
+
+    ChipsWithTitle(
+        title = stringResource(id = R.string.screen_orientation_option),
+        chips = ReaderScreenOrientation.entries.map {
+            ButtonItem(
+                id = it.toString(),
+                title = when (it.code) {
+                    ReaderScreenOrientation.FREE.code -> stringResource(id = R.string.screen_orientation_free)
+                    ReaderScreenOrientation.PORTRAIT.code -> stringResource(id = R.string.screen_orientation_portrait)
+                    ReaderScreenOrientation.LANDSCAPE.code -> stringResource(id = R.string.screen_orientation_landscape)
+                    ReaderScreenOrientation.LOCKED_PORTRAIT.code -> stringResource(id = R.string.screen_orientation_locked_portrait)
+                    ReaderScreenOrientation.LOCKED_LANDSCAPE.code -> stringResource(id = R.string.screen_orientation_locked_landscape)
+                    else -> stringResource(id = R.string.default_string)
+                },
+                textStyle = MaterialTheme.typography.labelLarge,
+                selected = it == state.value.screenOrientation
+            )
+        },
+        onClick = {
+            onMainEvent(
+                MainEvent.OnChangeScreenOrientation(
+                    it.id
+                )
+            )
+        }
+    )
+}
\ No newline at end of file
diff --git a/app/src/main/java/ua/acclorite/book_story/presentation/screens/settings/nested/reader/components/subcategories/SystemSubcategory.kt b/app/src/main/java/ua/acclorite/book_story/presentation/screens/settings/nested/reader/components/subcategories/SystemSubcategory.kt
new file mode 100644
index 00000000..e01c8fc6
--- /dev/null
+++ b/app/src/main/java/ua/acclorite/book_story/presentation/screens/settings/nested/reader/components/subcategories/SystemSubcategory.kt
@@ -0,0 +1,39 @@
+@file:Suppress("FunctionName")
+
+package ua.acclorite.book_story.presentation.screens.settings.nested.reader.components.subcategories
+
+import androidx.compose.foundation.lazy.LazyListScope
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.Dp
+import ua.acclorite.book_story.R
+import ua.acclorite.book_story.presentation.screens.settings.components.SettingsSubcategory
+import ua.acclorite.book_story.presentation.screens.settings.nested.reader.components.settings.ScreenOrientationSetting
+
+/**
+ * System subcategory.
+ * Contains all settings that are related to system (e.g. screen orientation).
+ */
+fun LazyListScope.SystemSubcategory(
+    titleColor: @Composable () -> Color = { MaterialTheme.colorScheme.primary },
+    title: @Composable () -> String = { stringResource(id = R.string.system_reader_settings) },
+    showTitle: Boolean = true,
+    showDivider: Boolean = true,
+    topPadding: Dp,
+    bottomPadding: Dp
+) {
+    SettingsSubcategory(
+        titleColor = titleColor,
+        title = title,
+        showTitle = showTitle,
+        showDivider = showDivider,
+        topPadding = topPadding,
+        bottomPadding = bottomPadding
+    ) {
+        item {
+            ScreenOrientationSetting()
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/ua/acclorite/book_story/presentation/screens/settings/nested/reader/data/ReaderScreenOrientation.kt b/app/src/main/java/ua/acclorite/book_story/presentation/screens/settings/nested/reader/data/ReaderScreenOrientation.kt
new file mode 100644
index 00000000..fc26f4b0
--- /dev/null
+++ b/app/src/main/java/ua/acclorite/book_story/presentation/screens/settings/nested/reader/data/ReaderScreenOrientation.kt
@@ -0,0 +1,16 @@
+package ua.acclorite.book_story.presentation.screens.settings.nested.reader.data
+
+import android.content.pm.ActivityInfo
+
+enum class ReaderScreenOrientation(val code: Int) {
+    DEFAULT(ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED),
+    FREE(ActivityInfo.SCREEN_ORIENTATION_USER),
+    PORTRAIT(ActivityInfo.SCREEN_ORIENTATION_USER_PORTRAIT),
+    LANDSCAPE(ActivityInfo.SCREEN_ORIENTATION_USER_LANDSCAPE),
+    LOCKED_PORTRAIT(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT),
+    LOCKED_LANDSCAPE(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE),
+}
+
+fun String.toReaderScreenOrientation(): ReaderScreenOrientation {
+    return ReaderScreenOrientation.valueOf(this)
+}
\ No newline at end of file
diff --git a/app/src/main/res/values-uk/strings.xml b/app/src/main/res/values-uk/strings.xml
index 1de88346..28b91cf0 100644
--- a/app/src/main/res/values-uk/strings.xml
+++ b/app/src/main/res/values-uk/strings.xml
@@ -1,5 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
+    <!-- Basic Strings -->
+    <string name="default_string">За замовчуванням</string>
 
     <!-- Notifications -->
     <string name="updates_notification_channel">Нові оновлення</string>
@@ -210,6 +212,7 @@
     <string name="padding_reader_settings">Відступи</string>
     <string name="misc_reader_settings">Інше</string>
     <string name="reading_speed_reader_settings">Швидкість читання</string>
+    <string name="system_reader_settings">Система</string>
     <string name="theme_appearance_settings">Налаштування теми</string>
     <string name="colors_appearance_settings">Кольори</string>
     <string name="general_browse_settings">Головні</string>
@@ -263,6 +266,7 @@
     <string name="check_for_text_update_option">Перевіряти на оновлення тексту</string>
     <string name="check_for_text_update_option_desc">Автоматично перевіряти чи є оновлення тексту</string>
     <string name="check_for_text_update_toast_option">Показувати повідомлення \"текст актуальний\"</string>
+    <string name="screen_orientation_option">Орієнтація екрана</string>
 
     <!-- Browse -->
     <string name="browse_files_structure_option">Структура файлів</string>
@@ -323,6 +327,13 @@
     <string name="text_alignment_center">Центр</string>
     <string name="text_alignment_end">Кінець</string>
 
+    <!-- Screen Orientation properties -->
+    <string name="screen_orientation_free">Вільно</string>
+    <string name="screen_orientation_portrait">Портрет</string>
+    <string name="screen_orientation_landscape">Альбом</string>
+    <string name="screen_orientation_locked_portrait">Заблокований портрет</string>
+    <string name="screen_orientation_locked_landscape">Заблокований альбом</string>
+
     <!-- Themes -->
     <string name="dynamic_theme">Меркурій</string>
     <string name="blue_theme">Нептун</string>
@@ -565,9 +576,6 @@
         Бажаєте дізнатися, як користуватися застосунком, прочитавши екран Допомоги?
     </string>
 
-    <!-- Font families -->
-    <string name="default_font">За замовчуванням</string>
-
     <!-- History -->
     <string name="today">Сьогодні</string>
     <string name="yesterday">Вчора</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 829544d0..b9cd9aa5 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -2,6 +2,7 @@
     <!-- Basic Strings -->
     <string name="app_version" translatable="false">1.2.0</string>
     <string name="app_name" translatable="false">Book\'s Story</string>
+    <string name="default_string">Default</string>
 
     <!-- Notifications -->
     <string name="updates_notification_channel">New updates</string>
@@ -212,6 +213,7 @@
     <string name="padding_reader_settings">Padding</string>
     <string name="misc_reader_settings">Misc</string>
     <string name="reading_speed_reader_settings">Reading speed</string>
+    <string name="system_reader_settings">System</string>
     <string name="theme_appearance_settings">Theme preferences</string>
     <string name="colors_appearance_settings">Colors</string>
     <string name="general_browse_settings">General</string>
@@ -265,6 +267,7 @@
     <string name="check_for_text_update_option">Check for text update</string>
     <string name="check_for_text_update_option_desc">Automatically check whether there is text update</string>
     <string name="check_for_text_update_toast_option">Show \"text is up-to-date\" toast</string>
+    <string name="screen_orientation_option">Screen orientation</string>
 
     <!-- Browse -->
     <string name="browse_files_structure_option">Files structure</string>
@@ -325,6 +328,13 @@
     <string name="text_alignment_center">Center</string>
     <string name="text_alignment_end">End</string>
 
+    <!-- Screen Orientation properties -->
+    <string name="screen_orientation_free">Free</string>
+    <string name="screen_orientation_portrait">Portrait</string>
+    <string name="screen_orientation_landscape">Landscape</string>
+    <string name="screen_orientation_locked_portrait">Locked portrait</string>
+    <string name="screen_orientation_locked_landscape">Locked landscape</string>
+
     <!-- Themes -->
     <string name="dynamic_theme">Mercury</string>
     <string name="blue_theme">Neptune</string>
@@ -566,9 +576,6 @@
         Would you like to learn how to use the app by reading Help screen?
     </string>
 
-    <!-- Font families -->
-    <string name="default_font">Default</string>
-
     <!-- History -->
     <string name="today">Today</string>
     <string name="yesterday">Yesterday</string>