Khmelnytskyi Oblast (Ukrainian: Хмельницька область, romanized: Khmelnytska oblast), also known as Khmelnychchyna (Ukrainian: Хмельниччина), is an oblast (province) in western Ukraine covering portions of the historical regions of western Podolia and southern Volhynia. The administrative center of the oblast is the city of Khmelnytskyi. The current estimated population is around 1,228,829 (2022 estimate).
Created in 1937 out of border okrugs of Vinnytsia Oblast, in 1941–44 it was under Nazi Germany occupation and part of the Reichskommissariat Ukraine (Wolhynien und Podolien general district). Following the Kamenets-Podolsky pocket in spring of 1944 as part of the Proskurov-Chernovtsy operation, Soviet troops removed the German occupation in the region. Until 4 February 1954 it was called Kamianets-Podilskyi Oblast (Ukrainian: Кам'янець-Подільська область, romanized: Kamianets-Podilska oblast) and was centered in Kamianets-Podilsky until 1941. The region rebranding took place after the official renaming of the region's administrative center to Khmelnytskyi.