State Highway 108 or SH 108 is a state highway that runs from Strawn to Stephenville. The route was proposed in 1926 as a renumbering of SH 10A.

SH 108 begins at an intersectio nwith SH 16 in downtown Strawn, and travels east out of town on Housley Street. The highway turns south in Mingus, where it intersects SH 193. South of Mingus, the highway intersects and briefly travels east with Interstate 20. The route then departs to the southeast, where it reaches Stephenville. The route intersects U.S. Routes 67 and 377 in Stephenville, before reaching its southern terminus at U.S. Route 281 just south of Stephenville.

SH 108 was originally designated in 1924 as a renumbering of SH 10A from Strawn to Stephenville, along with an extension southward to San Antonio. By 1933, this extension was redesignated as the new state-length State Highway 66. SH 108 has followed the same routing since that time.

State Highway 108A was a spur routing of SH 108 that led from Lampasas east through Temple to Rosebud. The route was designated in 1926, replacing SH 36, which was truncated at Temple. By 1933, the route had been renumbered as SH 53, as the route no longer connected to its parent highway.