| Teams | 32 | ||||
|---|---|---|---|---|---|
| Finals site | Springfield, Massachusetts | ||||
| Champions | North Alabama Lions (2nd title) | ||||
| Runner-up | Bridgeport Knights (1st title game) | ||||
| Semifinalists |
| ||||
| Winning coach | Gary Elliott (1st title) | ||||
| MOP | Lambert Shell (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.

Regional participants
| 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
Regionals
New England - Worcester, Massachusetts
Location: Andrew Laska Gymnasium Host: Assumption College
| Regional semifinals Round of 32 March 15 | Regional final Sweet 16 March 16 | ||||||||
| Franklin Pierce | 82 | ||||||||
| Merrimack | 79 | ||||||||
| Franklin Pierce | 77 | ||||||||
| Bridgeport | 81 | ||||||||
| Bridgeport | 94 | ||||||||
| Assumption | 87 | ||||||||
- Third Place - Merrimack 89, Assumption 71
East - Slippery Rock, Pennsylvania
Location: Morrow Field House Host: Slippery Rock University of Pennsylvania
| Regional semifinals Round of 32 March 15 | Regional final Sweet 16 March 16 | ||||||||
| Philadelphia U | 62 | ||||||||
| Shippensburg | 50 | ||||||||
| Philadelphia U | 64 | ||||||||
| C.W. Post | 63 | ||||||||
| C.W. Post | 70 | ||||||||
| Slippery Rock | 66 | ||||||||
- Third Place - Slippery Rock 119, Shippensburg 101
South Central - Warrensburg, Missouri
Location: CMSU Fieldhouse Host: Central Missouri State University
| Regional semifinals Round of 32 March 15 | Regional final Sweet 16 March 16 | ||||||||
| Southwest Baptist | 98 | ||||||||
| Kentucky Wesleyan | 81 | ||||||||
| Southwest Baptist | 63 | ||||||||
| Central Missouri State | 61 | ||||||||
| Central Missouri State | 72 | ||||||||
| West Texas State | 69 | ||||||||
- Third Place - Kentucky Wesleyan 91, West Texas State 78
West - Bakersfield, California
Location: CSUB Student Activities Center Host: California State University, Bakersfield
| Regional semifinals Round of 32 March 15 | Regional final Sweet 16 March 16 | ||||||||
| Alaska–Anchorage | 74 | ||||||||
| Chico State | 69 | ||||||||
| Alaska–Anchorage | 68 | ||||||||
| Cal State Los Angeles | 78 | ||||||||
| Cal State Los Angeles | 75 | ||||||||
| UC Riverside | 62 | ||||||||
- Third Place - UC Riverside 90, Chico State 82
North Central - Grand Forks, North Dakota
Location: Hyslop Sports Center Host: University of North Dakota
| Regional semifinals Round of 32 March 15 | Regional final Sweet 16 March 16 | ||||||||
| South Dakota State | 92 | ||||||||
| Metro State | 79 | ||||||||
| South Dakota State | 51 | ||||||||
| North Dakota | 54 | ||||||||
| North Dakota | 90 | ||||||||
| Nebraska–Kearney | 60 | ||||||||
- Third Place - Metro State 99, Nebraska–Kearney 92
South Atlantic - Charlotte, North Carolina
Location: Brayboy Gymnasium Host: Johnson C. Smith University
| Regional semifinals Round of 32 March 15 | Regional final Sweet 16 March 16 | ||||||||
| Virginia Union | 89 | ||||||||
| Morehouse | 79 | ||||||||
| Virginia Union | 77 | ||||||||
| USC Spartanburg | 73 | ||||||||
| USC Spartanburg | 99 | ||||||||
| Johnson C. Smith | 74 | ||||||||
- Third Place - Johnson C. Smith 102, Morehouse 89
South - Troy, Alabama
Location: Sartain Hall Host: Troy State University
| Regional semifinals Round of 32 March 15 | Regional final Sweet 16 March 16 | ||||||||
| North Alabama | 94 | ||||||||
| Hampton | 80 | ||||||||
| North Alabama | 93 | ||||||||
| Troy State | 86 | ||||||||
| Troy State | 78 | ||||||||
| Florida Southern | 73 | ||||||||
- Third Place - Hampton 70, Florida Southern 68
Great Lakes - Ashland, Ohio
Location: Kates Gymnasium Host: Ashland University
| Regional semifinals Round of 32 March 15 | Regional final Sweet 16 March 16 | ||||||||
| Grand Valley State | 78 | ||||||||
| Bellarmine | 73 | ||||||||
| Grand Valley State | 75 | ||||||||
| Ashland | 82 | ||||||||
| Ashland | 103 | ||||||||
| Missouri Western State | 72 | ||||||||
- Third Place - Bellarmine 94, Missouri Western State 83
*denotes each overtime played
Elite Eight - Springfield, Massachusetts
Location: Springfield Civic Center Hosts: American International College and Springfield College
| National Quarterfinals Elite Eight March 21 | National semifinals Final Four March 22 | National championship March 23 | ||||||||||||
| Bridgeport | 69 | |||||||||||||
| Philadelphia U | 62 | |||||||||||||
| Bridgeport | 73* | |||||||||||||
| Cal State Los Angeles | 66 | |||||||||||||
| Southwest Baptist | 52 | |||||||||||||
| Cal State Los Angeles | 55 | |||||||||||||
| Bridgeport | 72 | |||||||||||||
| North Alabama | 79 | |||||||||||||
| North Dakota | 63 | |||||||||||||
| Virginia Union | 64 | |||||||||||||
| Virginia Union | 76 | |||||||||||||
| North Alabama | 97 | |||||||||||||
| North Alabama | 92 | |||||||||||||
| Ashland | 84 | |||||||||||||
*denotes each overtime played
All-tournament team
- Pat Morris (Bridgeport)
- Lambert Shell (Bridgeport)
- Chris Lacey (CS Los Angeles)
- Allen Williams (North Alabama)
- Carl Wilmer (North Alabama)