State Highway 126 (abbreviated SH-126) was a state highway in McClain County, Oklahoma. It ran from State Highway 76 north of Dibble to State Highway 24 in Washington, paralleling State Highway 74B. The route was 9.1 miles (14.6 km) long, and did not have any lettered spur routes.SH-126 existed as a state highway for about ten years, from 1956 to 1966. After it was decommissioned, it was given to McClain County.