Minnesota State Highway 55 is a state highway that runs 221 miles (356 km) across the central part of state taking a diagonal route from its western most at the North Dakota state line near Tenney to its easternmost point at the intersection with U.S. Highway 61 (US 61) in Hastings. In Minneapolis and Golden Valley, portions of the route are also signed as Olson Memorial Highway.

Hastings is a city mostly in Dakota County, Minnesota, of which it is the county seat, with a portion in Washington County, Minnesota, United States. It is near the confluence of the Mississippi, Vermillion, and St. Croix Rivers. The population was 22,154 at the 2020 census. It is named for the first elected governor of Minnesota, Henry Hastings Sibley.