| State: | MN |
| Type: | MN-old |
| Route: | 81 |
| Map Custom: | yes |
| Map Notes: | Former MN 81 highlighted in red |
| Established: | 1934 |
| Decommissioned: | mid-1950s |
| Length Mi: | 40.3 |
| Section: | 115 |
| Subsection: | 106 |
| Direction A: | South |
| Terminus A: | in Hendrum Township |
| Direction B: | North |
| Terminus B: | in Crookston |
| Counties: | Norman, Polk |
Minnesota State Highway 81 was a state highway in the U.S. state of Minnesota. It ran north from what is now TH 200 to Crookston. It was eliminated when US 75 was realigned to this road in the mid-1950s.
The highway was 40miles in length.
Highway 81 served as a north-south route between Halstad, Shelly, Nielsville, Climax, Eldred, and Crookston.
Legally, the highway was defined as Legislative Route 175 in the Minnesota Statutes § 161.115(106).[1]
State Highway 81 was authorized in 1934.
The number was removed in the mid-1950s when U.S. Route 75 was realigned to this road.