diff --git a/com.unity.netcode.gameobjects/CHANGELOG.md b/com.unity.netcode.gameobjects/CHANGELOG.md
index 1b8180ae57..d86ea3e9da 100644
--- a/com.unity.netcode.gameobjects/CHANGELOG.md
+++ b/com.unity.netcode.gameobjects/CHANGELOG.md
@@ -10,6 +10,7 @@ Additional documentation and release notes are available at [Multiplayer Documen
 
 ### Added
 
+- Added context menu tool that provides users with the ability to quickly update the GlobalObjectIdHash value for all in-scene placed prefab instances that were created prior to adding a NetworkObject component to it. (#2707)
 - Added methods NetworkManager.SetPeerMTU and NetworkManager.GetPeerMTU to be able to set MTU sizes per-peer (#2676)
 
 ### Fixed
diff --git a/com.unity.netcode.gameobjects/Runtime/Core/NetworkObject.cs b/com.unity.netcode.gameobjects/Runtime/Core/NetworkObject.cs
index 64bf640627..2055d766a6 100644
--- a/com.unity.netcode.gameobjects/Runtime/Core/NetworkObject.cs
+++ b/com.unity.netcode.gameobjects/Runtime/Core/NetworkObject.cs
@@ -49,6 +49,53 @@ public uint PrefabIdHash
 #if UNITY_EDITOR
         private const string k_GlobalIdTemplate = "GlobalObjectId_V1-{0}-{1}-{2}-{3}";
 
+        /// <summary>
+        /// Object Types <see href="https://docs.unity3d.com/ScriptReference/GlobalObjectId.html"/>
+        /// </summary>
+        // 0 = Null (when considered a null object type we can ignore)
+        // 1 = Imported Asset
+        // 2 = Scene Object
+        // 3 = Source Asset.
+        private const int k_NullObjectType = 0;
+        private const int k_ImportedAssetObjectType = 1;
+        private const int k_SceneObjectType = 2;
+        private const int k_SourceAssetObjectType = 3;
+
+        [ContextMenu("Refresh In-Scene Prefab Instances")]
+        internal void RefreshAllPrefabInstances()
+        {
+            var instanceGlobalId = GlobalObjectId.GetGlobalObjectIdSlow(this);
+            if (!PrefabUtility.IsPartOfAnyPrefab(this) || instanceGlobalId.identifierType != k_ImportedAssetObjectType)
+            {
+                EditorUtility.DisplayDialog("Network Prefab Assets Only", "This action can only be performed on a network prefab asset.", "Ok");
+                return;
+            }
+
+            // Handle updating the currently active scene
+            var networkObjects = FindObjectsByType<NetworkObject>(FindObjectsInactive.Include, FindObjectsSortMode.None);
+            foreach (var networkObject in networkObjects)
+            {
+                networkObject.OnValidate();
+            }
+            NetworkObjectRefreshTool.ProcessActiveScene();
+
+            // Refresh all build settings scenes
+            var activeScene = SceneManager.GetActiveScene();
+            foreach (var editorScene in EditorBuildSettings.scenes)
+            {
+                // skip disabled scenes and the currently active scene
+                if (!editorScene.enabled || activeScene.path == editorScene.path)
+                {
+                    continue;
+                }
+                // Add the scene to be processed
+                NetworkObjectRefreshTool.ProcessScene(editorScene.path, false);
+            }
+
+            // Process all added scenes
+            NetworkObjectRefreshTool.ProcessScenes();
+        }
+
         private void OnValidate()
         {
             GenerateGlobalObjectIdHash();
@@ -71,8 +118,9 @@ internal void GenerateGlobalObjectIdHash()
             // Get a global object identifier for this network prefab
             var globalId = GetGlobalId();
 
+
             // if the identifier type is 0, then don't update the GlobalObjectIdHash
-            if (globalId.identifierType == 0)
+            if (globalId.identifierType == k_NullObjectType)
             {
                 return;
             }
@@ -83,25 +131,65 @@ internal void GenerateGlobalObjectIdHash()
             // If the GlobalObjectIdHash value changed, then mark the asset dirty
             if (GlobalObjectIdHash != oldValue)
             {
-                EditorUtility.SetDirty(this);
+                // Check if this is an in-scnee placed NetworkObject (Special Case for In-Scene Placed)
+                if (!IsEditingPrefab() && gameObject.scene.name != null && gameObject.scene.name != gameObject.name)
+                {
+                    // Sanity check to make sure this is a scene placed object
+                    if (globalId.identifierType != k_SceneObjectType)
+                    {
+                        // This should never happen, but in the event it does throw and error
+                        Debug.LogError($"[{gameObject.name}] is detected as an in-scene placed object but its identifier is of type {globalId.identifierType}! **Report this error**");
+                    }
+
+                    // If this is a prefab instance
+                    if (PrefabUtility.IsPartOfAnyPrefab(this))
+                    {
+                        // We must invoke this in order for the modifications to get saved with the scene (does not mark scene as dirty)
+                        PrefabUtility.RecordPrefabInstancePropertyModifications(this);
+                    }
+
+                    NetworkObjectRefreshTool.ProcessScene(gameObject.scene.path);
+                }
+                else // Otherwise, this is a standard network prefab asset so we just mark it dirty for the AssetDatabase to update it
+                {
+                    EditorUtility.SetDirty(this);
+                }
             }
         }
 
-        private GlobalObjectId GetGlobalId()
+        private bool IsEditingPrefab()
         {
-            var instanceGlobalId = GlobalObjectId.GetGlobalObjectIdSlow(this);
-
             // Check if we are directly editing the prefab
             var stage = PrefabStageUtility.GetPrefabStage(gameObject);
 
             // if we are not editing the prefab directly (or a sub-prefab), then return the object identifier
             if (stage == null || stage.assetPath == null)
+            {
+                return false;
+            }
+            return true;
+        }
+
+        private GlobalObjectId GetGlobalId()
+        {
+            var instanceGlobalId = GlobalObjectId.GetGlobalObjectIdSlow(this);
+
+            // If not editing a prefab, then just use the generated id
+            if (!IsEditingPrefab())
             {
                 return instanceGlobalId;
             }
 
             // If the asset doesn't exist at the given path, then return the object identifier
-            var theAsset = AssetDatabase.LoadAssetAtPath<NetworkObject>(stage.assetPath);
+            var prefabStageAssetPath = PrefabStageUtility.GetPrefabStage(gameObject).assetPath;
+            // If (for some reason) the asset path is null return the generated id
+            if (prefabStageAssetPath == null)
+            {
+                return instanceGlobalId;
+            }
+
+            var theAsset = AssetDatabase.LoadAssetAtPath<NetworkObject>(prefabStageAssetPath);
+            // If there is no asset at that path (for some odd/edge case reason), return the generated id
             if (theAsset == null)
             {
                 return instanceGlobalId;
@@ -110,25 +198,24 @@ private GlobalObjectId GetGlobalId()
             // If we can't get the asset GUID and/or the file identifier, then return the object identifier
             if (!AssetDatabase.TryGetGUIDAndLocalFileIdentifier(theAsset, out var guid, out long localFileId))
             {
-                Debug.Log($"[GlobalObjectId Gen][{theAsset.gameObject.name}] Failed to get GUID or the local file identifier. Returning default ({instanceGlobalId}).");
                 return instanceGlobalId;
             }
 
-            // If we reached this point, then we are most likely opening a prefab to edit.            
+            // Note: If we reached this point, then we are most likely opening a prefab to edit.
             // The instanceGlobalId will be constructed as if it is a scene object, however when it
             // is serialized its value will be treated as a file asset (the "why" to the below code).
 
-            // Construct an imported asset identifier with the type being a source asset (type 3).
-            var prefabGlobalIdText = string.Format(k_GlobalIdTemplate, 3, guid, localFileId, 0);
+            // Construct an imported asset identifier with the type being a source asset object type
+            var prefabGlobalIdText = string.Format(k_GlobalIdTemplate, k_SourceAssetObjectType, guid, (ulong)localFileId, 0);
 
             // If we can't parse the result log an error and return the instanceGlobalId
             if (!GlobalObjectId.TryParse(prefabGlobalIdText, out var prefabGlobalId))
             {
-                Debug.LogError($"[GlobalObjectId Gen] Failed to parse ({prefabGlobalIdText}) returning default ({instanceGlobalId})");
+                Debug.LogError($"[GlobalObjectId Gen] Failed to parse ({prefabGlobalIdText}) returning default ({instanceGlobalId})! ** Please Report This Error **");
                 return instanceGlobalId;
             }
 
-            // Otherwise, return the constructed identifier.
+            // Otherwise, return the constructed identifier for the source prefab asset
             return prefabGlobalId;
         }
 #endif // UNITY_EDITOR
diff --git a/com.unity.netcode.gameobjects/Runtime/Core/NetworkObjectRefreshTool.cs b/com.unity.netcode.gameobjects/Runtime/Core/NetworkObjectRefreshTool.cs
new file mode 100644
index 0000000000..b9c6db0cf9
--- /dev/null
+++ b/com.unity.netcode.gameobjects/Runtime/Core/NetworkObjectRefreshTool.cs
@@ -0,0 +1,118 @@
+#if UNITY_EDITOR
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using UnityEditor.SceneManagement;
+using UnityEngine;
+using UnityEngine.SceneManagement;
+
+namespace Unity.Netcode
+{
+    /// <summary>
+    /// This is a helper tool to update all in-scene placed instances of a prefab that 
+    /// originally did not have a NetworkObject component but one was added to the prefab
+    /// later.
+    /// </summary>
+    internal class NetworkObjectRefreshTool
+    {
+        private static List<string> s_ScenesToUpdate = new List<string>();
+        private static bool s_ProcessScenes;
+        private static bool s_CloseScenes;
+
+        internal static Action AllScenesProcessed;
+
+        internal static void ProcessScene(string scenePath, bool processScenes = true)
+        {
+            if (!s_ScenesToUpdate.Contains(scenePath))
+            {
+                if (s_ScenesToUpdate.Count == 0)
+                {
+                    EditorSceneManager.sceneOpened += EditorSceneManager_sceneOpened;
+                    EditorSceneManager.sceneSaved += EditorSceneManager_sceneSaved;
+                }
+                s_ScenesToUpdate.Add(scenePath);
+            }
+            s_ProcessScenes = processScenes;
+        }
+
+        internal static void ProcessActiveScene()
+        {
+            var activeScene = SceneManager.GetActiveScene();
+            if (s_ScenesToUpdate.Contains(activeScene.path) && s_ProcessScenes)
+            {
+                SceneOpened(activeScene);
+            }
+        }
+
+        internal static void ProcessScenes()
+        {
+            if (s_ScenesToUpdate.Count != 0)
+            {
+                s_CloseScenes = true;
+                var scenePath = s_ScenesToUpdate.First();
+                EditorSceneManager.OpenScene(scenePath, OpenSceneMode.Additive);
+            }
+            else
+            {
+                s_CloseScenes = false;
+                EditorSceneManager.sceneSaved -= EditorSceneManager_sceneSaved;
+                EditorSceneManager.sceneOpened -= EditorSceneManager_sceneOpened;
+                AllScenesProcessed?.Invoke();
+            }
+        }
+
+        private static void FinishedProcessingScene(Scene scene, bool refreshed = false)
+        {
+            if (s_ScenesToUpdate.Contains(scene.path))
+            {
+                // Provide a log of all scenes that were modified to the user
+                if (refreshed)
+                {
+                    Debug.Log($"Refreshed and saved updates to scene: {scene.name}");
+                }
+                s_ProcessScenes = false;
+                s_ScenesToUpdate.Remove(scene.path);
+
+                if (scene != SceneManager.GetActiveScene())
+                {
+                    EditorSceneManager.CloseScene(scene, s_CloseScenes);
+                }
+                ProcessScenes();
+            }
+        }
+
+        private static void EditorSceneManager_sceneSaved(Scene scene)
+        {
+            FinishedProcessingScene(scene, true);
+        }
+
+        private static void SceneOpened(Scene scene)
+        {
+            if (s_ScenesToUpdate.Contains(scene.path))
+            {
+                if (s_ProcessScenes)
+                {
+                    if (!EditorSceneManager.MarkSceneDirty(scene))
+                    {
+                        Debug.Log($"Scene {scene.name} did not get marked as dirty!");
+                        FinishedProcessingScene(scene);
+                    }
+                    else
+                    {
+                        EditorSceneManager.SaveScene(scene);
+                    }
+                }
+                else
+                {
+                    FinishedProcessingScene(scene);
+                }
+            }
+        }
+
+        private static void EditorSceneManager_sceneOpened(Scene scene, OpenSceneMode mode)
+        {
+            SceneOpened(scene);
+        }
+    }
+}
+#endif // UNITY_EDITOR
diff --git a/com.unity.netcode.gameobjects/Runtime/Core/NetworkObjectRefreshTool.cs.meta b/com.unity.netcode.gameobjects/Runtime/Core/NetworkObjectRefreshTool.cs.meta
new file mode 100644
index 0000000000..58a3178608
--- /dev/null
+++ b/com.unity.netcode.gameobjects/Runtime/Core/NetworkObjectRefreshTool.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: d24d5e8371c3cca4890e2713bdeda288
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/com.unity.netcode.gameobjects/TestHelpers/Runtime/NetcodeIntegrationTestHelpers.cs b/com.unity.netcode.gameobjects/TestHelpers/Runtime/NetcodeIntegrationTestHelpers.cs
index 90f19624fd..8e6cf7b2be 100644
--- a/com.unity.netcode.gameobjects/TestHelpers/Runtime/NetcodeIntegrationTestHelpers.cs
+++ b/com.unity.netcode.gameobjects/TestHelpers/Runtime/NetcodeIntegrationTestHelpers.cs
@@ -924,6 +924,19 @@ public static uint GetGlobalObjectIdHash(NetworkObject networkObject)
         {
             return networkObject.GlobalObjectIdHash;
         }
+
+#if UNITY_EDITOR
+        public static void SetRefreshAllPrefabsCallback(Action scenesProcessed)
+        {
+            NetworkObjectRefreshTool.AllScenesProcessed = scenesProcessed;
+        }
+
+        public static void RefreshAllPrefabInstances(NetworkObject networkObject, Action scenesProcessed)
+        {
+            NetworkObjectRefreshTool.AllScenesProcessed = scenesProcessed;
+            networkObject.RefreshAllPrefabInstances();
+        }
+#endif
     }
 
     // Empty MonoBehaviour that is a holder of coroutine