Starokostiantyniv is a city in Khmelnytskyi Raion, in Khmelnytskyi Oblast, Ukraine. Starokostiantyniv lies at 265 m above sea level. It has 33,921 inhabitants (2022). The nearest city is Khmelnytskyi, 41 km to the southwest. Among the landmarks around are Samchyky Palace and Park Ensemble (12.7 km), Starokostiantyniv Castle (0.4 km) and Dominican monastery in Starokostiantyniv (0.3 km).
Also written Старокостянтинів.