Stigler is a city in and county seat of Haskell County, Oklahoma, United States. The population was 2,685 at the 2010 census, down from the figure of 2,731 recorded in 2000.
At the time of its founding, Newman, later Stigler, was located in Sans Bois County, a part of the Moshulatubbee District of the Choctaw Nation in Indian Territory. A post office was established at Newman, Indian Territory on April 30, 1892. The community was named for Dr. Martin W. Newman, a pioneer territorial physician.
Joseph Stigler is said to have founded the town in 1889. He was familiar with the area, as earlier he had served as a deputy marshal under federal judge Isaac Parker, whose court in Fort Smith, Arkansas, had jurisdiction over Indian Territory. The post office name was changed to Stigler on May 3, 1893 by the U.S. Post Office Service, because the former name caused some confusion with the town of Norman.
The Midland Valley Railroad was constructed to Stigler in 1904, which attracted more settlers and more types of businesses. By the following year, the town had become incorporated. At statehood in 1907, Stigler was named as the county seat of newly created Haskell County.
Stigler is home to the Haskell County Courthouse. In the late 20th century, the county court was known for having installed marble plaques inscribed with the Ten Commandments and the Mayflower Compact on the front lawn of the courthouse.