diff --git a/src/main/java/world/bentobox/bentobox/listeners/JoinLeaveListener.java b/src/main/java/world/bentobox/bentobox/listeners/JoinLeaveListener.java
index 605e020c3..11c750889 100644
--- a/src/main/java/world/bentobox/bentobox/listeners/JoinLeaveListener.java
+++ b/src/main/java/world/bentobox/bentobox/listeners/JoinLeaveListener.java
@@ -105,6 +105,24 @@ public class JoinLeaveListener implements Listener {
 
         // Add a player to the bStats cache.
         plugin.getMetrics().ifPresent(bStats -> bStats.addPlayer(playerUUID));
+
+        // Create onIsland placeholders
+        plugin.getAddonsManager().getGameModeAddons().forEach(addon -> {
+            plugin.getPlaceholdersManager()
+                    .registerPlaceholder(addon, "onisland_" + user.getName(), asker -> {
+                        if (asker == null) {
+                            return "";
+                        }
+                        // Get the user who this applies to
+                        User named = User.getInstance(user.getUniqueId());
+                        if (named.isOnline()) {
+                            return plugin.getIslands().getIslands(addon.getOverWorld(), asker).stream()
+                                    .filter(island -> island.onIsland(named.getLocation())).findFirst().map(i -> "true")
+                                    .orElse("false");
+                        }
+                        return "false";
+                    });
+        });
     }
 
     private void firstTime(User user) {
@@ -237,6 +255,9 @@ public class JoinLeaveListener implements Listener {
                 });
         // Remove any coop associations from the player logging out
         plugin.getIslands().clearRank(RanksManager.COOP_RANK, event.getPlayer().getUniqueId());
+        // Remove any onisland placeholder
+        plugin.getAddonsManager().getGameModeAddons().forEach(addon -> plugin.getPlaceholdersManager()
+                .unregisterPlaceholder(addon, "onisland_" + event.getPlayer().getName()));
         User.removePlayer(event.getPlayer());
     }
 }
diff --git a/src/main/java/world/bentobox/bentobox/lists/GameModePlaceholder.java b/src/main/java/world/bentobox/bentobox/lists/GameModePlaceholder.java
index 5677b3c89..032617d26 100644
--- a/src/main/java/world/bentobox/bentobox/lists/GameModePlaceholder.java
+++ b/src/main/java/world/bentobox/bentobox/lists/GameModePlaceholder.java
@@ -19,6 +19,7 @@ import world.bentobox.bentobox.util.Util;
 
 /**
  * Common Game Mode Placeholders
+ * All of these are prefixed with the game mode's name, e.g., bskykblock_
  */
 public enum GameModePlaceholder {
 
diff --git a/src/test/java/world/bentobox/bentobox/listeners/JoinLeaveListenerTest.java b/src/test/java/world/bentobox/bentobox/listeners/JoinLeaveListenerTest.java
index 21127e72e..43a8b1e1e 100644
--- a/src/test/java/world/bentobox/bentobox/listeners/JoinLeaveListenerTest.java
+++ b/src/test/java/world/bentobox/bentobox/listeners/JoinLeaveListenerTest.java
@@ -52,6 +52,7 @@ import world.bentobox.bentobox.api.addons.GameModeAddon;
 import world.bentobox.bentobox.api.user.User;
 import world.bentobox.bentobox.database.objects.Island;
 import world.bentobox.bentobox.database.objects.Players;
+import world.bentobox.bentobox.managers.AddonsManager;
 import world.bentobox.bentobox.managers.IslandWorldManager;
 import world.bentobox.bentobox.managers.IslandsManager;
 import world.bentobox.bentobox.managers.LocalesManager;
@@ -107,6 +108,9 @@ public class JoinLeaveListenerTest {
     @Mock
     private @NonNull Location location;
 
+    @Mock
+    private AddonsManager am;
+
     /**
      */
     @Before
@@ -218,6 +222,9 @@ public class JoinLeaveListenerTest {
         when(phm.replacePlaceholders(any(), anyString()))
                 .thenAnswer((Answer<String>) invocation -> invocation.getArgument(1, String.class));
 
+        // Addons manager
+        when(plugin.getAddonsManager()).thenReturn(am);
+
         jll = new JoinLeaveListener(plugin);
     }