| State: | MO |
| Type: | MO |
| Route: | 91 |
| Maint: | MoDOT |
| Length Mi: | 28.765 |
| Direction B: | North |
| Direction A: | South |
| Terminus B: | north of Advance |
| Junction: | in Morley |
| Terminus A: | in Morley |
| Previous Type: | MO |
| Previous Route: | 90 |
| Next Type: | MO |
| Next Route: | 92 |
| Map Custom: | yes |
| Map Notes: | MO 91 highlighted in red |
Route 91 is a short highway in southeastern Missouri. Its northern terminus is at Route 51 in Bollinger County; its southern terminus is at U.S. Route 61 in Morley. The last 22miles southbound run east, not south.