1938–39 Long Island Blackbirds men's basketball team

1938–39 Long Island Blackbirds men's basketball
National Invitation Tournament Champions
Helms Foundation National Champions
Premo-Porretta National Champions
ConferenceIndependent
Record23–0
Head coach

The 1938–39 Long Island Blackbirds men's basketball team represented Long Island University during the 1938–39 NCAA men's basketball season in the United States. The head coach was Clair Bee, coaching in his eighth season with the Blackbirds. The team finished the season with a 23–0 record.

The Blackbirds won the second-ever National Invitation Tournament (NIT), going 3–0 in the tournament with a win over Loyola of Chicago in the championship game.

The team was later retroactively named the national champion by the Helms Athletic Foundation and the Premo-Porretta Power Poll.