The 2018–19 Fairfield Stags men's basketball team represented Fairfield University in the 2018–19 NCAA Division I men's basketball season. They played their home games at Webster Bank Arena in Bridgeport, Connecticut and Alumni Hall in Fairfield, Connecticut as members of the Metro Atlantic Athletic Conference, and were led by eighth year head coach Sydney Johnson. They finished the 2018–19 season 9–22 overall, 6–12 in MAAC play to finish in a three-way tie for ninth place. As the 10th seed in the 2019 MAAC tournament, they were defeated by No. 7 seed Manhattan in the first round 53–57.