Haskell County is a county located in the southeast quadrant of the U.S. state of Oklahoma. As of the 2020 census, the population was 11,561. Its county seat is Stigler. The county is named in honor of Charles N. Haskell, the first governor of Oklahoma.

Stigler is a city in and county seat of Haskell County, Oklahoma. The population was 2,685 at the time of the 2010 census, down from 2,731 recorded in 2000.