The 2018–19 Siena Saints men's basketball team represented Siena College during the 2018–19 NCAA Division I men's basketball season. They played their home games at the Times Union Center in Albany, New York as members of the Metro Atlantic Athletic Conference and were led by first-year head coach Jamion Christian. They finished the 2018–19 season 17–16 overall, 11–7 in MAAC play to finish in a four-way tie for second place. As the 5th seed in the 2019 MAAC tournament, they defeated No. 4 seed Rider in the quarterfinals 87–81 before falling to No. 1 seed Iona 57–73 in the semifinals.