Osmaniye Province (Turkish: Osmaniye ili) is a Turkish province located in southern Turkey. It existed as a province by the name Cebel-i Bereket (meaning "Fertile Mountain") in the early republic until 1933, when it was incorporated into Adana Province. It was made a province again in 1996. It covers an area of 3,767 km² and has a population of 479,221 (2010 est). The province is situated in Çukurova, a geographical, economical and cultural region.
The capital of the province is Osmaniye (Population: 194,000). The next largest towns are Kadirli (Population: 83,618) and Düziçi (Population: 42,000).