State Highway 105 (abbreviated SH-105) is a state highway in the north-central part of the U.S. state of Oklahoma. It runs for 29.11 miles (46.85 km) across Logan and Lincoln Counties. It has no lettered spur routes. SH-105 was formed over the course of 1955. The eastern half of the road was added to the state highway system first, in January of that year, followed by the western half, added in June.