1983–84 Lamar Cardinals basketball team


 * For information on all Lamar University sports, see Lamar Cardinals and Lady Cardinals

The 1983–84 Lamar Cardinals basketball team represented Lamar University during the 1983–84 NCAA Division I men's basketball season. The Cardinals were led by fourth-year head coach Pat Foster and played their home games at the Beaumont Civic Center in Beaumont, Texas as members of the Southland Conference. The Cardinals won the regular season conference championship. They fell to the Louisiana Tech in the 1984 SLC tournament. They received an invitation to the 1984 National Invitation Tournament where they defeated in the first round and lost to  in the second round. Lamar finished the season with a record of 26–5 (11–1 Southland).

Roster
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Schedule and results
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!colspan=12 style=| Non-conference regular season

!colspan=12 style=| Southland regular season

!colspan=12 style=| Southland tournament

!colspan=12 style=| National Invitation Tournament