The 2018–19 Niagara Purple Eagles men's basketball team represented Niagara University in the 2018–19 NCAA Division I men's basketball season.

They played their home games at the Gallagher Center in Lewiston, New York as members of the Metro Atlantic Athletic Conference, and were led by 6th-year head coach Chris Casey.

On March 11, 2019, head coach Chris Casey was fired.

On March 28, 2019, Niagara hired Patrick Beilein as their new head coach.

They were invited to the CollegeInsider.com Tournament, where they lost in the first round to Eastern Michigan.