State Highway 55 is a state highway in the U.S. state of Texas. It runs from Uvalde northwestward through the western Hill Country onto the Edwards Plateau, ending south of Sonora.

The original plan extended SH 55 farther south from Uvalde south through Catarina and then east to Artesia Wells. By 1933, SH 55 was rerouted through Batesville to Dilley, as the route from Uvalde to Catarina was transferred to SH 4 and the portion from Catarina to Artesia Wells was renumbered as SH 189. The portion from Uvalde to just south of Batesville was constructed through the mid-1940s, but was cancelled in 1945 and transferred to FM 117.