diff --git a/src/server/game/Instances/InstanceScript.cpp b/src/server/game/Instances/InstanceScript.cpp
index 21413f716..2d6735753 100644
--- a/src/server/game/Instances/InstanceScript.cpp
+++ b/src/server/game/Instances/InstanceScript.cpp
@@ -28,6 +28,7 @@
 #include "Opcodes.h"
 #include "Pet.h"
 #include "Player.h"
+#include "ScriptMgr.h"
 #include "Spell.h"
 #include "WorldSession.h"
 
@@ -307,6 +308,7 @@ bool InstanceScript::SetBossState(uint32 id, EncounterState state)
     if (id < bosses.size())
     {
         BossInfo* bossInfo = &bosses[id];
+        sScriptMgr->OnBeforeSetBossState(id, state, bossInfo->state, instance);
         if (bossInfo->state == TO_BE_DECIDED) // loading
         {
             bossInfo->state = state;
diff --git a/src/server/game/Scripting/ScriptDefines/GlobalScript.cpp b/src/server/game/Scripting/ScriptDefines/GlobalScript.cpp
index f20e9515c..1e10185de 100644
--- a/src/server/game/Scripting/ScriptDefines/GlobalScript.cpp
+++ b/src/server/game/Scripting/ScriptDefines/GlobalScript.cpp
@@ -15,6 +15,7 @@
  * with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include "InstanceScript.h"
 #include "Player.h"
 #include "ScriptMgr.h"
 #include "ScriptMgrMacros.h"
@@ -189,3 +190,20 @@ void ScriptMgr::OnInstanceIdRemoved(uint32 instanceId)
         script->OnInstanceIdRemoved(instanceId);
     });
 }
+
+/**
+ * @brief Called when any raid boss has their state updated (e.g. pull, reset, kill).
+ * @details Careful checks for old- and newState are required, since it can fire multiple times and not only when combat starts/ends.
+ *
+ * @param id The id of the boss in the [instance]
+ * @param newState The new boss state to be applied to this boss
+ * @param oldState The previously assigned state of this boss
+ * @param instance A pointer to the [map] object of the instance
+ */
+void ScriptMgr::OnBeforeSetBossState(uint32 id, EncounterState newState, EncounterState oldState, Map* instance)
+{
+    ExecuteScript<GlobalScript>([&](GlobalScript* script)
+    {
+        script->OnBeforeSetBossState(id, newState, oldState, instance);
+    });
+}
diff --git a/src/server/game/Scripting/ScriptMgr.h b/src/server/game/Scripting/ScriptMgr.h
index 450ecc630..a94922d7d 100644
--- a/src/server/game/Scripting/ScriptMgr.h
+++ b/src/server/game/Scripting/ScriptMgr.h
@@ -27,6 +27,7 @@
 #include "DynamicObject.h"
 #include "GameEventMgr.h"
 #include "Group.h"
+#include "InstanceScript.h"
 #include "LFGMgr.h"
 #include "ObjectMgr.h"
 #include "PetDefines.h"
@@ -1597,6 +1598,9 @@ public:
 
     // Called when instance id is removed from database (e.g. instance reset)
     virtual void OnInstanceIdRemoved(uint32 /*instanceId*/) { }
+
+    // Called when any raid boss has their state updated (e.g. pull, reset, kill)
+    virtual void OnBeforeSetBossState(uint32 /*id*/, EncounterState /*newState*/, EncounterState /*oldState*/, Map* /*instance*/) { }
 };
 
 class BGScript : public ScriptObject
@@ -2431,6 +2435,7 @@ public: /* GlobalScript */
     void OnLoadSpellCustomAttr(SpellInfo* spell);
     bool OnAllowedForPlayerLootCheck(Player const* player, ObjectGuid source);
     void OnInstanceIdRemoved(uint32 instanceId);
+    void OnBeforeSetBossState(uint32 id, EncounterState newState, EncounterState oldState, Map* instance);
 
 public: /* Scheduled scripts */
     uint32 IncreaseScheduledScriptsCount() { return ++_scheduledScripts; }