Starokostiantyniv (Ukrainian: Старокостянтинів; Yiddish: אלט-קאָנסטאַנטין‏ Alt Konstantin) is a city in the Khmelnytskyi Oblast (province) of western Ukraine. Serving as the administrative center of the Starokostiantyniv Raion (district), the city itself is also designated as a separate raion within the oblast.