The 2019 Atlantic 10 men's basketball tournament was the postseason men's basketball tournament for the Atlantic 10 Conference's 2018–19 season.

Saint Louis defeated St. Bonaventure 55–53 in the championship game to win the tournament, and received the A10's automatic bid to the NCAA tournament.

[1] All 14 A-10 schools will participate in the tournament.

Teams will be seeded by record within the conference, with a tiebreaker system to seed teams with identical conference records.

The top 10 teams receive a first-round bye and the top four teams receive a double bye.