South Dakota Highway 168 (SD 168) is a state highway in Butte County in the U.S. state of South Dakota.

The highway is maintained by the South Dakota Department of Transportation (SDDOT), and is not part of the National Highway System.

SD 168 begins at an intersection with US 85 in Butte County and treks southeast through rolling plains.

The route continues in this direction for approximately seven miles (11 km) before meeting its eastern terminus at an intersection with SD 79 north of Castle Rock.

[1] The designation is not a part of the National Highway System,[4] a system of highways important to the nation's defense, economy, and mobility.