diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/AppModule.java b/app/src/main/java/ml/docilealligator/infinityforreddit/AppModule.java
index 49120eca..f2fd9ed8 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/AppModule.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/AppModule.java
@@ -282,6 +282,13 @@ class AppModule {
         return mApplication.getSharedPreferences(SharedPreferencesUtils.POST_DETAILS_SHARED_PREFERENCES_FILE, Context.MODE_PRIVATE);
     }
 
+    @Provides
+    @Named("security")
+    @Singleton
+    SharedPreferences provideSecuritySharedPreferences() {
+        return mApplication.getSharedPreferences(SharedPreferencesUtils.SECURITY_SHARED_PREFERENCES_FILE, Context.MODE_PRIVATE);
+    }
+
     @Provides
     @Singleton
     CustomThemeWrapper provideCustomThemeWrapper(@Named("light_theme") SharedPreferences lightThemeSharedPreferences,
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/Infinity.java b/app/src/main/java/ml/docilealligator/infinityforreddit/Infinity.java
index 63df2552..39e56874 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/Infinity.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/Infinity.java
@@ -29,6 +29,7 @@ import javax.inject.Named;
 import ml.docilealligator.infinityforreddit.activities.LockScreenActivity;
 import ml.docilealligator.infinityforreddit.broadcastreceivers.NetworkWifiStatusReceiver;
 import ml.docilealligator.infinityforreddit.broadcastreceivers.WallpaperChangeReceiver;
+import ml.docilealligator.infinityforreddit.events.ChangeAppLockEvent;
 import ml.docilealligator.infinityforreddit.events.ChangeNetworkStatusEvent;
 import ml.docilealligator.infinityforreddit.events.ToggleSecureModeEvent;
 import ml.docilealligator.infinityforreddit.utils.SharedPreferencesUtils;
@@ -37,11 +38,13 @@ import ml.docilealligator.infinityforreddit.utils.Utils;
 public class Infinity extends Application implements LifecycleObserver {
     private AppComponent mAppComponent;
     private NetworkWifiStatusReceiver mNetworkWifiStatusReceiver;
-    private boolean lock = false;
+    private boolean appLock;
+    private long appLockTimeout;
+    private boolean canStartLockScreenActivity = false;
     private boolean isSecureMode;
     @Inject
-    @Named("default")
-    SharedPreferences mSharedPreferences;
+    @Named("security")
+    SharedPreferences mSecuritySharedPreferences;
 
     @Override
     public void onCreate() {
@@ -53,7 +56,9 @@ public class Infinity extends Application implements LifecycleObserver {
 
         mAppComponent.inject(this);
 
-        isSecureMode = mSharedPreferences.getBoolean(SharedPreferencesUtils.SECURE_MODE, false);
+        appLock = mSecuritySharedPreferences.getBoolean(SharedPreferencesUtils.APP_LOCK, false);
+        appLockTimeout = Long.parseLong(mSecuritySharedPreferences.getString(SharedPreferencesUtils.APP_LOCK_TIMEOUT, "600000"));
+        isSecureMode = mSecuritySharedPreferences.getBoolean(SharedPreferencesUtils.SECURE_MODE, false);
 
         registerActivityLifecycleCallbacks(new ActivityLifecycleCallbacks() {
             @Override
@@ -70,11 +75,13 @@ public class Infinity extends Application implements LifecycleObserver {
 
             @Override
             public void onActivityResumed(@NonNull Activity activity) {
-                if (lock && !(activity instanceof LockScreenActivity)) {
-                    lock = false;
+                if (canStartLockScreenActivity && appLock
+                        && System.currentTimeMillis() - mSecuritySharedPreferences.getLong(SharedPreferencesUtils.LAST_UNLOCK_TIME, 0) >= appLockTimeout
+                        && !(activity instanceof LockScreenActivity)) {
                     Intent intent = new Intent(activity, LockScreenActivity.class);
                     activity.startActivity(intent);
                 }
+                canStartLockScreenActivity = false;
             }
 
             @Override
@@ -125,11 +132,11 @@ public class Infinity extends Application implements LifecycleObserver {
 
     @OnLifecycleEvent(Lifecycle.Event.ON_START)
     public void appInForeground() {
-        lock = true;
+        canStartLockScreenActivity = true;
     }
 
     @OnLifecycleEvent(Lifecycle.Event.ON_STOP)
-    public void appInBackground(){
+    public void appInBackground() {
 
     }
 
@@ -141,4 +148,10 @@ public class Infinity extends Application implements LifecycleObserver {
     public void onToggleSecureModeEvent(ToggleSecureModeEvent secureModeEvent) {
         isSecureMode = secureModeEvent.isSecureMode;
     }
+
+    @Subscribe
+    public void onChangeAppLockEvent(ChangeAppLockEvent changeAppLockEvent) {
+        appLock = changeAppLockEvent.appLock;
+        appLockTimeout = changeAppLockEvent.appLockTimeout;
+    }
 }
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/activities/LockScreenActivity.java b/app/src/main/java/ml/docilealligator/infinityforreddit/activities/LockScreenActivity.java
index 42544ecd..7569ab66 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/activities/LockScreenActivity.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/activities/LockScreenActivity.java
@@ -24,6 +24,7 @@ import butterknife.ButterKnife;
 import ml.docilealligator.infinityforreddit.Infinity;
 import ml.docilealligator.infinityforreddit.R;
 import ml.docilealligator.infinityforreddit.customtheme.CustomThemeWrapper;
+import ml.docilealligator.infinityforreddit.utils.SharedPreferencesUtils;
 
 public class LockScreenActivity extends BaseActivity {
 
@@ -35,6 +36,9 @@ public class LockScreenActivity extends BaseActivity {
     @Named("default")
     SharedPreferences mSharedPreferences;
     @Inject
+    @Named("security")
+    SharedPreferences mSecurityPreferences;
+    @Inject
     CustomThemeWrapper mCustomThemeWrapper;
 
     @Override
@@ -67,6 +71,7 @@ public class LockScreenActivity extends BaseActivity {
                 public void onAuthenticationSucceeded(
                         @NonNull BiometricPrompt.AuthenticationResult result) {
                     super.onAuthenticationSucceeded(result);
+                    saveUnlockTime();
                     finish();
                 }
             });
@@ -78,10 +83,16 @@ public class LockScreenActivity extends BaseActivity {
 
             biometricPrompt.authenticate(promptInfo);
         } else {
+            saveUnlockTime();
             finish();
         }
     }
 
+    private void saveUnlockTime() {
+        mSecurityPreferences.edit().putLong(SharedPreferencesUtils.LAST_UNLOCK_TIME, System.currentTimeMillis()).apply();
+    }
+
+
     @Override
     protected SharedPreferences getDefaultSharedPreferences() {
         return mSharedPreferences;
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/events/ChangeAppLockEvent.java b/app/src/main/java/ml/docilealligator/infinityforreddit/events/ChangeAppLockEvent.java
new file mode 100644
index 00000000..affa5125
--- /dev/null
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/events/ChangeAppLockEvent.java
@@ -0,0 +1,11 @@
+package ml.docilealligator.infinityforreddit.events;
+
+public class ChangeAppLockEvent {
+    public boolean appLock;
+    public long appLockTimeout;
+
+    public ChangeAppLockEvent(boolean appLock, long appLockTimeout) {
+        this.appLock = appLock;
+        this.appLockTimeout = appLockTimeout;
+    }
+}
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/settings/SecurityPreferenceFragment.java b/app/src/main/java/ml/docilealligator/infinityforreddit/settings/SecurityPreferenceFragment.java
index c4dd2b16..83163020 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/settings/SecurityPreferenceFragment.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/settings/SecurityPreferenceFragment.java
@@ -11,7 +11,9 @@ import androidx.annotation.NonNull;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.biometric.BiometricPrompt;
 import androidx.core.content.ContextCompat;
+import androidx.preference.ListPreference;
 import androidx.preference.PreferenceFragmentCompat;
+import androidx.preference.PreferenceManager;
 import androidx.preference.SwitchPreference;
 
 import org.greenrobot.eventbus.EventBus;
@@ -23,6 +25,7 @@ import javax.inject.Named;
 
 import ml.docilealligator.infinityforreddit.Infinity;
 import ml.docilealligator.infinityforreddit.R;
+import ml.docilealligator.infinityforreddit.events.ChangeAppLockEvent;
 import ml.docilealligator.infinityforreddit.events.ChangeRequireAuthToAccountSectionEvent;
 import ml.docilealligator.infinityforreddit.events.ToggleSecureModeEvent;
 import ml.docilealligator.infinityforreddit.utils.SharedPreferencesUtils;
@@ -36,12 +39,16 @@ public class SecurityPreferenceFragment extends PreferenceFragmentCompat {
 
     @Override
     public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
+        PreferenceManager preferenceManager = getPreferenceManager();
+        preferenceManager.setSharedPreferencesName(SharedPreferencesUtils.SECURITY_SHARED_PREFERENCES_FILE);
         setPreferencesFromResource(R.xml.security_preferences, rootKey);
 
         ((Infinity) activity.getApplication()).getAppComponent().inject(this);
 
         SwitchPreference requireAuthToAccountSectionSwitch = findPreference(SharedPreferencesUtils.REQUIRE_AUTHENTICATION_TO_GO_TO_ACCOUNT_SECTION_IN_NAVIGATION_DRAWER);
         SwitchPreference secureModeSwitch = findPreference(SharedPreferencesUtils.SECURE_MODE);
+        SwitchPreference appLockSwitch = findPreference(SharedPreferencesUtils.APP_LOCK);
+        ListPreference appLockTimeoutListPreference = findPreference(SharedPreferencesUtils.APP_LOCK_TIMEOUT);
 
         if (requireAuthToAccountSectionSwitch != null) {
             requireAuthToAccountSectionSwitch.setOnPreferenceChangeListener((preference, newValue) -> {
@@ -56,6 +63,18 @@ public class SecurityPreferenceFragment extends PreferenceFragmentCompat {
                 return true;
             });
         }
+
+        if (appLockSwitch != null && appLockTimeoutListPreference != null) {
+            appLockSwitch.setOnPreferenceChangeListener((preference, newValue) -> {
+                EventBus.getDefault().post(new ChangeAppLockEvent((Boolean) newValue, Long.parseLong(appLockTimeoutListPreference.getValue())));
+                return true;
+            });
+
+            appLockTimeoutListPreference.setOnPreferenceChangeListener((preference, newValue) -> {
+                EventBus.getDefault().post(new ChangeAppLockEvent(appLockSwitch.isChecked(), Long.parseLong((String) newValue)));
+                return true;
+            });
+        }
     }
 
     @Override
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/utils/SharedPreferencesUtils.java b/app/src/main/java/ml/docilealligator/infinityforreddit/utils/SharedPreferencesUtils.java
index 7760f465..a2d243b2 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/utils/SharedPreferencesUtils.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/utils/SharedPreferencesUtils.java
@@ -132,7 +132,6 @@ public class SharedPreferencesUtils {
     public static final String ENABLE_SWIPE_ACTION = "enable_swipe_action";
     public static final String SWIPE_ACTION_THRESHOLD = "swipe_action_threshold";
     public static final String PULL_TO_REFRESH = "pull_to_refresh";
-    public static final String REQUIRE_AUTHENTICATION_TO_GO_TO_ACCOUNT_SECTION_IN_NAVIGATION_DRAWER = "require_auth_to_account_section";
     public static final String LONG_PRESS_TO_HIDE_TOOLBAR_IN_COMPACT_LAYOUT = "long_press_to_hide_toolbar_in_compact_layout";
     public static final String POST_COMPACT_LAYOUT_TOOLBAR_HIDDEN_BY_DEFAULT = "post_compact_layout_toolbar_hidden_by_default";
     public static final String SECURITY = "security";
@@ -186,7 +185,6 @@ public class SharedPreferencesUtils {
     public static final String REMEMBER_MUTING_OPTION_IN_POST_FEED = "remember_muting_option_in_post_feed";
     public static final String DEFAULT_LINK_POST_LAYOUT_KEY = "default_link_post_layout";
     public static final String USE_BOTTOM_TOOLBAR_IN_MEDIA_VIEWER = "use_bottom_toolbar_in_media_viewer";
-    public static final String SECURE_MODE = "secure_mode";
     public static final String LOCK_SCREEN_ANIMATION = "lock_screen_animation";
 
     public static final String DEFAULT_PREFERENCES_FILE = "ml.docilealligator.infinityforreddit_preferences";
@@ -326,6 +324,13 @@ public class SharedPreferencesUtils {
     public static final String SEPARATE_POST_AND_COMMENTS_IN_PORTRAIT_MODE = "separate_post_and_comments_in_portrait_mode";
     public static final String SEPARATE_POST_AND_COMMENTS_IN_LANDSCAPE_MODE = "separate_post_and_comments_in_landscape_mode";
 
+    public static final String SECURITY_SHARED_PREFERENCES_FILE = "ml.docilealligator.infinityforreddit.security";
+    public static final String REQUIRE_AUTHENTICATION_TO_GO_TO_ACCOUNT_SECTION_IN_NAVIGATION_DRAWER = "require_auth_to_account_section";
+    public static final String SECURE_MODE = "secure_mode";
+    public static final String APP_LOCK = "app_lock";
+    public static final String APP_LOCK_TIMEOUT = "app_lock_timeout";
+    public static final String LAST_UNLOCK_TIME = "last_unlock_time";
+
     //Legacy Settings
     public static final String MAIN_PAGE_TAB_1_TITLE_LEGACY = "main_page_tab_1_title";
     public static final String MAIN_PAGE_TAB_2_TITLE_LEGACY = "main_page_tab_2_title";
diff --git a/app/src/main/res/values/arrays.xml b/app/src/main/res/values/arrays.xml
index a2d77399..f8097c33 100644
--- a/app/src/main/res/values/arrays.xml
+++ b/app/src/main/res/values/arrays.xml
@@ -466,4 +466,42 @@
         <item>@string/exclude_domain</item>
     </string-array>
 
+    <string-array name="settings_app_lock_timeout">
+        <item>@string/app_lock_timeout_immediately</item>
+        <item>@string/app_lock_timeout_1_min</item>
+        <item>@string/app_lock_timeout_2_mins</item>
+        <item>@string/app_lock_timeout_5_mins</item>
+        <item>@string/app_lock_timeout_10_mins</item>
+        <item>@string/app_lock_timeout_15_mins</item>
+        <item>@string/app_lock_timeout_20_mins</item>
+        <item>@string/app_lock_timeout_30_mins</item>
+        <item>@string/app_lock_timeout_1_hour</item>
+        <item>@string/app_lock_timeout_2_hours</item>
+        <item>@string/app_lock_timeout_3_hours</item>
+        <item>@string/app_lock_timeout_4_hours</item>
+        <item>@string/app_lock_timeout_5_hours</item>
+        <item>@string/app_lock_timeout_6_hours</item>
+        <item>@string/app_lock_timeout_12_hours</item>
+        <item>@string/app_lock_timeout_24_hours</item>
+    </string-array>
+
+    <string-array name="settings_app_lock_timeout_values">
+        <item>0</item>
+        <item>60000</item>
+        <item>120000</item>
+        <item>300000</item>
+        <item>600000</item>
+        <item>900000</item>
+        <item>1200000</item>
+        <item>1800000</item>
+        <item>3600000</item>
+        <item>7200000</item>
+        <item>10800000</item>
+        <item>14400000</item>
+        <item>18000000</item>
+        <item>21600000</item>
+        <item>43200000</item>
+        <item>86400000</item>
+    </string-array>
+
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 1de4ba0f..68ab820b 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -597,6 +597,9 @@
     <string name="settings_secure_mode_title">Secure Mode</string>
     <string name="settings_secure_mode_summary">Screenshot and video recording are not allowed. No preview in recent app screen.</string>
     <string name="settings_credits_lock_screen_animation_title">Lock Screen Animation</string>
+    <string name="settings_app_lock_title">App Lock</string>
+    <string name="settings_app_lock_summary">Require authentication before using the app</string>
+    <string name="settings_app_lock_timeout_title">App Lock Timeout</string>
 
     <string name="no_link_available">Cannot get the link</string>
 
@@ -1171,5 +1174,21 @@
     <string name="material_you_notification_title">Applying Material You</string>
 
     <string name="lock_screen_text">Whoa there!!!</string>
+    <string name="app_lock_timeout_immediately">Immediately</string>
+    <string name="app_lock_timeout_1_min">1 minute</string>
+    <string name="app_lock_timeout_2_mins">2 minutes</string>
+    <string name="app_lock_timeout_5_mins">5 minutes</string>
+    <string name="app_lock_timeout_10_mins">10 minutes</string>
+    <string name="app_lock_timeout_15_mins">15 minutes</string>
+    <string name="app_lock_timeout_20_mins">20 minutes</string>
+    <string name="app_lock_timeout_30_mins">30 minutes</string>
+    <string name="app_lock_timeout_1_hour">1 hour</string>
+    <string name="app_lock_timeout_2_hours">2 hours</string>
+    <string name="app_lock_timeout_3_hours">3 hours</string>
+    <string name="app_lock_timeout_4_hours">4 hours</string>
+    <string name="app_lock_timeout_5_hours">5 hours</string>
+    <string name="app_lock_timeout_6_hours">6 hours</string>
+    <string name="app_lock_timeout_12_hours">12 hours</string>
+    <string name="app_lock_timeout_24_hours">24 hours</string>
 
 </resources>
diff --git a/app/src/main/res/xml/security_preferences.xml b/app/src/main/res/xml/security_preferences.xml
index 636f1798..d1f2fbc2 100644
--- a/app/src/main/res/xml/security_preferences.xml
+++ b/app/src/main/res/xml/security_preferences.xml
@@ -11,4 +11,22 @@
         app:title="@string/settings_secure_mode_title"
         app:summary="@string/settings_secure_mode_summary" />
 
+    <SwitchPreference
+        app:defaultValue="false"
+        app:key="app_lock"
+        app:icon="@drawable/ic_outline_lock_24dp"
+        app:title="@string/settings_app_lock_title"
+        app:summary="@string/settings_app_lock_summary" />
+
+    <ListPreference
+        app:defaultValue="600000"
+        app:entries="@array/settings_app_lock_timeout"
+        app:entryValues="@array/settings_app_lock_timeout_values"
+        app:key="app_lock_timeout"
+        app:icon="@drawable/ic_outline_access_time_24dp"
+        app:title="@string/settings_app_lock_timeout_title"
+        app:useSimpleSummaryProvider="true" />
+
+
+
 </PreferenceScreen>
\ No newline at end of file