| Mode: | Basketball |
| Sex: | none |
| Sport: | Basketball |
| Year: | 1990–91 |
| Team: | LSU Tigers |
| Conference: | Southeast Conference |
| Division: | West Division |
| Short Conf: | SEC |
| Coachrank: | 21 |
| Aprank: | 22 |
| Record: | 20–10 |
| Conf Record: | 13–5 |
| Hc Year: | 19th |
| Asst Coach1: | Johnny Jones |
| Ac1 Year: | 7th |
| Asst Coach2: | Bob Starkey |
| Ac2 Year: | 1st |
| Champion: | SEC regular season co-champions |
| Bowl Result: | first round |
The 1990-91 LSU Tigers men's basketball team represented Louisiana State University during the 1990–91 NCAA men's college basketball season. The head coach was Dale Brown. The team was a member of the Southeastern Conference and played their home games at Pete Maravich Assembly Center.
|-!colspan=9 style=| Non-conference regular season
|-!colspan=9 style=| SEC regular season|-!colspan=12 style=| SEC Tournament|-!colspan=12 style=| NCAA Tournament
See also: 1990–91 NCAA Division I men's basketball rankings.