| Division: | II |
| Year: | 1991 |
| Gender: | Men's |
| Teams: | 32 |
| Finalfourcity: | Springfield, Massachusetts |
| Champions: | North Alabama Lions |
| Titlecount: | 2nd |
| Runnerup: | Bridgeport Knights |
| Gamecount: | 1st |
| Semifinal1: | Bakersfield State Roadrunners |
| Finalfourcount: | 4th |
| Semifinal2: | Virginia Union Panthers |
| Finalfourcount2: | 2nd |
| Coach: | Gary Elliott |
| Coachcount: | 1st |
| Mop: | Lambert Shell |
| Mopteam: | Bridgeport |
| Attendance: | 45,580 |
The 1991 NCAA Division II men's basketball tournament involved 32 schools playing in a single-elimination tournament to determine the national champion of men's NCAA Division II college basketball as a culmination of the 1990-91 NCAA Division II men's basketball season. It was won by the University of North Alabama and Bridgeport's Lambert Shell was the Most Outstanding Player.
| School | Outcome | |
|---|---|---|
| Assumption | Fourth Place | |
| Bridgeport | Regional Champion | |
| Franklin Pierce | Runner-up | |
| Merrimack | Third Place | |
| School | Outcome | |
|---|---|---|
| C.W. Post | Runner-up | |
| Philadelphia U | Regional Champion | |
| Shippensburg | Fourth Place | |
| Slippery Rock | Third Place | |
| School | Outcome | |
|---|---|---|
| Central Missouri State | Runner-up | |
| Kentucky Wesleyan | Third Place | |
| Southwest Baptist | Regional Champion | |
| West Texas State | Fourth Place | |
| School | Outcome | |
|---|---|---|
| Alaska–Anchorage | Runner-up | |
| Cal State Bakersfield | Regional Champion | |
| Chico State | Fourth Place | |
| UC Riverside | Third Place | |
| School | Outcome | |
|---|---|---|
| Metro State | Third Place | |
| Nebraska–Kearney | Fourth Place | |
| North Dakota | Regional Champion | |
| South Dakota State | Runner-up | |
| School | Outcome | |
|---|---|---|
| Johnson C. Smith | Third Place | |
| Morehouse | Fourth Place | |
| USC Spartanburg | Runner-up | |
| Virginia Union | Regional Champion | |
| School | Outcome | |
|---|---|---|
| Hampton | Third Place | |
| Florida Southern | Fourth Place | |
| North Alabama | Regional Champion | |
| Troy State | Runner-up | |
| School | Outcome | |
|---|---|---|
| Ashland | Regional Champion | |
| Bellarmine | Third Place | |
| Grand Valley State | Runner-up | |
| Missouri Western State | Fourth Place | |
*denotes tie
Location: Andrew Laska Gymnasium Host: Assumption College
Location: Morrow Field House Host: Slippery Rock University of Pennsylvania
Location: CMSU Fieldhouse Host: Central Missouri State University
Location: CSUB Student Activities Center Host: California State University, Bakersfield
Location: Hyslop Sports Center Host: University of North Dakota
Location: Brayboy Gymnasium Host: Johnson C. Smith University
Location: Sartain Hall Host: Troy State University
Location: Kates Gymnasium Host: Ashland University
*denotes each overtime played
Location: Springfield Civic Center Hosts: American International College and Springfield College*denotes each overtime played