South Dakota Highway 158 (SD 158) is a 9.150-mile-long (14.725 km) state highway in Vernon Township, Grant County, South Dakota, United States.

It travels from an intersection with SD 15 and SD 20 to the Minnesota state line, where it continues as County State-Aid Highway 44 (CSAH 44) in Lac qui Parle County.

The highway continues east for approximately nine miles (14 km) before curving to the northeast and ending at the Minnesota state line, continuing for 1.94 miles (3.12 km) as CSAH 44, before terminating at CSAH 7.

[2][3] The route has a speed limit of 65 miles per hour (105 km/h) for its entire duration.

[5] The entire route is in Vernon Township, Grant County.