diff --git a/AOS/app/src/main/java/boostcamp/and07/mindsync/ui/main/MainActivity.kt b/AOS/app/src/main/java/boostcamp/and07/mindsync/ui/main/MainActivity.kt
index d8553ba7..e16ac8ee 100644
--- a/AOS/app/src/main/java/boostcamp/and07/mindsync/ui/main/MainActivity.kt
+++ b/AOS/app/src/main/java/boostcamp/and07/mindsync/ui/main/MainActivity.kt
@@ -18,6 +18,7 @@ import boostcamp.and07.mindsync.databinding.ActivityMainBinding
 import boostcamp.and07.mindsync.ui.base.BaseActivity
 import boostcamp.and07.mindsync.ui.base.BaseActivityViewModel
 import boostcamp.and07.mindsync.ui.boardlist.UsersAdapter
+import boostcamp.and07.mindsync.ui.dialog.DisConnectedNetworkDialog
 import boostcamp.and07.mindsync.ui.profile.ProfileActivity
 import boostcamp.and07.mindsync.ui.space.list.SpaceListFragmentDirections
 import boostcamp.and07.mindsync.ui.util.ThrottleDuration
@@ -54,6 +55,7 @@ class MainActivity :
         setSideBarNavigation()
         setBinding()
         observeEvent()
+        showDisconnectedNetworkDialog()
     }
 
     override fun getViewModel(): BaseActivityViewModel {
@@ -83,6 +85,22 @@ class MainActivity :
         }
     }
 
+    private fun showDisconnectedNetworkDialog() {
+        val dialog = DisConnectedNetworkDialog(mainViewModel.isConnected)
+        lifecycleScope.launch {
+            repeatOnLifecycle(Lifecycle.State.STARTED) {
+                mainViewModel.isConnected.collectLatest { isConnected ->
+                    if (isConnected.not()) {
+                        dialog.show(
+                            this@MainActivity.supportFragmentManager,
+                            "DisConnectedNetworkDialog",
+                        )
+                    }
+                }
+            }
+        }
+    }
+
     private fun setNavController() {
         val navHostFragment =
             (supportFragmentManager.findFragmentById(R.id.fcv_main_nav_host) as NavHostFragment)
@@ -213,7 +231,11 @@ class MainActivity :
         spaceAdapter.setSideBarClickListener(
             object : SpaceClickListener {
                 override fun onClickSpace(space: Space) {
-                    navController.navigate(SpaceListFragmentDirections.actionToBoardListFragment(spaceId = space.id))
+                    navController.navigate(
+                        SpaceListFragmentDirections.actionToBoardListFragment(
+                            spaceId = space.id,
+                        ),
+                    )
                     mainViewModel.updateCurrentSpace(space)
                 }
             },