diff --git a/core/smn_player.cpp b/core/smn_player.cpp
index f260b3d5..0345a12e 100644
--- a/core/smn_player.cpp
+++ b/core/smn_player.cpp
@@ -18,7 +18,6 @@
 #include "HalfLife2.h"
 #include "sourcemod.h"
 #include "ChatTriggers.h"
-#include "GameConfigs.h"
 #include <inetchannel.h>
 #include <iclient.h>
 
@@ -168,6 +167,27 @@ static cell_t sm_IsClientFakeClient(IPluginContext *pCtx, const cell_t *params)
 	return (pPlayer->IsFakeClient()) ? 1 : 0;
 }
 
+static cell_t IsClientObserver(IPluginContext *pContext, const cell_t *params)
+{
+	int client = params[1];
+
+	CPlayer *pPlayer = g_Players.GetPlayerByIndex(client);
+	if (!pPlayer)
+	{
+		return pContext->ThrowNativeError("Client index %d is invalid", client);
+	} else if (!pPlayer->IsInGame()) {
+		return pContext->ThrowNativeError("Client %d is not in game", client);
+	}
+
+	IPlayerInfo *pInfo = pPlayer->GetPlayerInfo();
+	if (!pInfo)
+	{
+		return pContext->ThrowNativeError("IPlayerInfo not supported by game");
+	}
+
+	return pInfo->IsObserver() ? 1 : 0;
+}
+
 static cell_t sm_GetClientInfo(IPluginContext *pContext, const cell_t *params)
 {
 	int client = params[1];
@@ -970,6 +990,7 @@ REGISTER_NATIVES(playernatives)
 	{"IsFakeClient",			sm_IsClientFakeClient},
 	{"IsPlayerInGame",			sm_IsClientInGame},			/* Backwards compat shim */
 	{"IsClientInGame",			sm_IsClientInGame},
+	{"IsClientObserver",		IsClientObserver},
 	{"RemoveUserFlags",			RemoveUserFlags},
 	{"SetUserAdmin",			SetUserAdmin},
 	{"SetUserFlagBits",			SetUserFlagBits},
diff --git a/plugins/include/clients.inc b/plugins/include/clients.inc
index 6860c6cd..df81bafa 100644
--- a/plugins/include/clients.inc
+++ b/plugins/include/clients.inc
@@ -187,6 +187,14 @@ native bool:IsClientAuthorized(client);
  */
 native bool:IsFakeClient(client);
 
+/**
+ * Returns if a certain player is an observer/spectator.
+ *
+ * @param client		Player index.
+ * @return				True if player is an obverser, false otherwise.
+ */
+native bool:IsClientObserver(client);
+
 /**
  * Retrieves values from client replicated keys.
  *