diff --git a/libdino/src/entity/settings.vala b/libdino/src/entity/settings.vala
index 8f39713f..9b1efa3a 100644
--- a/libdino/src/entity/settings.vala
+++ b/libdino/src/entity/settings.vala
@@ -15,6 +15,7 @@ public class Settings : Object {
         default_encryption = col_to_encryption_or_default("default_encryption", Encryption.UNKNOWN);
         send_button = col_to_bool_or_default("send_button", false);
         enter_newline = col_to_bool_or_default("enter_newline", false);
+        dark_theme = col_to_bool_or_default("dark_theme", false);
     }
 
     private bool col_to_bool_or_default(string key, bool def) {
@@ -128,6 +129,20 @@ public class Settings : Object {
             enter_newline_ = value;
         }
     }
+
+    public signal void dark_theme_update(bool is_dark);
+    private bool dark_theme_;
+    public bool dark_theme {
+        get { return dark_theme_; }
+        set {
+            db.settings.upsert()
+                .value(db.settings.key, "dark_theme", true)
+                .value(db.settings.value, value.to_string())
+                .perform();
+            dark_theme_ = value;
+            dark_theme_update(value);
+        }
+    }
 }
 
 }
diff --git a/main/data/settings_dialog.ui b/main/data/settings_dialog.ui
index 04bd548b..5fafe36d 100644
--- a/main/data/settings_dialog.ui
+++ b/main/data/settings_dialog.ui
@@ -140,6 +140,23 @@
                         </child>
                     </object>
                 </child>
+                <child>
+                    <object class="AdwPreferencesGroup">
+                        <child>
+                            <object class="AdwActionRow">
+                                <property name="title" translatable="yes">_Dark theme</property>
+                                <property name="subtitle" translatable="yes">If disabled, use system settings</property>
+                                <property name="use-underline">True</property>
+                                <property name="activatable-widget">dark_theme</property>
+                                <child type="suffix">
+                                    <object class="GtkSwitch" id="dark_theme">
+                                        <property name="valign">center</property>
+                                    </object>
+                                </child>
+                            </object>
+                        </child>
+                    </object>
+                </child>
             </object>
         </child>
     </template>
diff --git a/main/po/en.po b/main/po/en.po
index 7fb7fc6f..c217e2d9 100644
--- a/main/po/en.po
+++ b/main/po/en.po
@@ -533,12 +533,10 @@ msgid "Local Settings"
 msgstr ""
 
 #: main/src/ui/contact_details/settings_provider.vala:28
-#: main/data/settings_dialog.ui:23
 msgid "Send typing notifications"
 msgstr ""
 
 #: main/src/ui/contact_details/settings_provider.vala:33
-#: main/data/settings_dialog.ui:32
 msgid "Send read receipts"
 msgstr ""
 
@@ -1012,16 +1010,52 @@ msgstr ""
 msgid "Add Contact"
 msgstr ""
 
-#: main/data/settings_dialog.ui:41
+#: main/data/settings_dialog.ui:14
+msgid "Default encryption for 1-on-1 chats"
+msgstr ""
+
+#: main/data/settings_dialog.ui:19
+msgid "Ask"
+msgstr ""
+
+#: main/data/settings_dialog.ui:57
+msgid "Send _Typing Notifications"
+msgstr ""
+
+#: main/data/settings_dialog.ui:85
+msgid "_Notifications"
+msgstr ""
+
+#: main/data/settings_dialog.ui:69
+msgid "Send _Read Receipts"
+msgstr ""
+
+#: main/data/settings_dialog.ui:86
 msgid "Notify when a new message arrives"
 msgstr ""
 
-#: main/data/settings_dialog.ui:50
-msgid "Convert smileys to emojis"
+#: main/data/settings_dialog.ui:102
+msgid "_Convert Smileys to Emoji"
 msgstr ""
 
-#: main/data/settings_dialog.ui:59
-msgid "Check spelling"
+#: main/data/settings_dialog.ui:118
+msgid "_Display send button"
+msgstr ""
+
+#: main/data/settings_dialog.ui:130
+msgid "_Use Enter key to start a new line"
+msgstr ""
+
+#: main/data/settings_dialog.ui:131
+msgid "If disabled, use Shift+Enter to start a new line"
+msgstr ""
+
+#: main/data/settings_dialog.ui:147
+msgid "_Dark theme"
+msgstr ""
+
+#: main/data/settings_dialog.ui:148
+msgid "If disabled, use system settings"
 msgstr ""
 
 #: main/data/im.dino.Dino.appdata.xml.in:7
diff --git a/main/po/ru.po b/main/po/ru.po
index 2b3af4d1..dad1e6f4 100644
--- a/main/po/ru.po
+++ b/main/po/ru.po
@@ -1028,17 +1028,53 @@ msgstr "Псевдоним"
 msgid "Add Contact"
 msgstr "Добавить контакт"
 
-#: main/data/settings_dialog.ui:41
+#: main/data/settings_dialog.ui:14
+msgid "Default encryption for 1-on-1 chats"
+msgstr "Шифрование по умолчанию для 1-на-1 чатов"
+
+#: main/data/settings_dialog.ui:19
+msgid "Ask"
+msgstr "Спрашивать"
+
+#: main/data/settings_dialog.ui:57
+msgid "Send _Typing Notifications"
+msgstr "Отправлять уведомления при наборе сообщения"
+
+#: main/data/settings_dialog.ui:85
+msgid "_Notifications"
+msgstr "Уведомления"
+
+#: main/data/settings_dialog.ui:69
+msgid "Send _Read Receipts"
+msgstr "Отправлять уведомления о прочтении"
+
+#: main/data/settings_dialog.ui:86
 msgid "Notify when a new message arrives"
 msgstr "Уведомлять о новых сообщениях"
 
-#: main/data/settings_dialog.ui:50
-msgid "Convert smileys to emojis"
+#: main/data/settings_dialog.ui:102
+msgid "_Convert Smileys to Emoji"
 msgstr "Превращать смайлы в эмодзи"
 
-#: main/data/settings_dialog.ui:59
-msgid "Check spelling"
-msgstr "Проверка орфографии"
+#: main/data/settings_dialog.ui:118
+msgid "_Display send button"
+msgstr "Показывать кнопку отправки"
+
+#: main/data/settings_dialog.ui:130
+msgid "_Use Enter key to start a new line"
+msgstr "Использовать Enter для вставки новой строки"
+
+#: main/data/settings_dialog.ui:131
+msgid "If disabled, use Shift+Enter to start a new line"
+msgstr "Если опция недоступна, используйте Shift+Enter для вставки новой строки"
+
+#: main/data/settings_dialog.ui:147
+msgid "_Dark theme"
+msgstr "Тёмная тема"
+
+#: main/data/settings_dialog.ui:148
+msgid "If disabled, use system settings"
+msgstr "Если опция недоступна, используйте настройки системы"
 
 #: main/data/im.dino.Dino.appdata.xml.in:7
 msgid "Modern XMPP Chat Client"
diff --git a/main/src/ui/application.vala b/main/src/ui/application.vala
index a1671364..1a7b4170 100644
--- a/main/src/ui/application.vala
+++ b/main/src/ui/application.vala
@@ -68,6 +68,19 @@ public class Dino.Ui.Application : Adw.Application, Dino.Application {
                     }
                 }
             });
+
+            settings.dark_theme_update.connect((is_dark) => {
+                var manager = Adw.StyleManager.get_default();
+                if (is_dark != manager.dark) {
+                    if (is_dark) {
+                        manager.set_color_scheme(Adw.ColorScheme.PREFER_DARK);
+                    } else {
+                        manager.set_color_scheme(Adw.ColorScheme.PREFER_LIGHT);
+                    }
+                }
+            });
+
+            settings.dark_theme_update(settings.dark_theme); // Change theme at startup.
         });
 
         activate.connect(() => {
diff --git a/main/src/ui/settings_dialog.vala b/main/src/ui/settings_dialog.vala
index 5bdcee99..8c20a84b 100644
--- a/main/src/ui/settings_dialog.vala
+++ b/main/src/ui/settings_dialog.vala
@@ -15,6 +15,7 @@ class SettingsDialog : Adw.PreferencesWindow {
     [GtkChild] private unowned CheckButton encryption_radio_openpgp;
     [GtkChild] private unowned Switch send_button_switch;
     [GtkChild] private unowned Switch enter_newline_switch;
+    [GtkChild] private unowned Switch dark_theme;
 
     Dino.Entities.Settings settings = Dino.Application.get_default().settings;
 
@@ -32,6 +33,8 @@ class SettingsDialog : Adw.PreferencesWindow {
         send_button_switch.active = settings.send_button;
         enter_newline_switch.active = settings.enter_newline;
         enter_newline_switch.sensitive = settings.send_button;
+        dark_theme.active = settings.dark_theme;
+        dark_theme.sensitive = !Adw.StyleManager.get_default().system_supports_color_schemes;
 
         typing_switch.notify["active"].connect(() => { settings.send_typing = typing_switch.active; } );
         marker_switch.notify["active"].connect(() => { settings.send_marker = marker_switch.active; } );
@@ -65,6 +68,7 @@ class SettingsDialog : Adw.PreferencesWindow {
                 enter_newline_switch.active = visible;
             }
         });
+        dark_theme.notify["active"].connect(() => { settings.dark_theme = dark_theme.active; });
     }
 }