There have been two Treaties of Rapallo:
The Treaty of Rapallo, 1920 was an agreement between Italy and the Kingdom of the Serbs, Croats and Slovenes (the later Yugoslavia) for the independence of the state of Fiume (now Rijeka) and Italian renunciation of claims to Dalmatia except Zara (now Zadar).
The Treaty of Rapallo, 1922 was an agreement between Germany and Soviet Russia on the renunciation of claims arising from World War I.