The 2017–18 Niagara Purple Eagles men's basketball team represented Niagara University during the 2017–18 NCAA Division I men's basketball season. The Purple Eagles, led by fifth-year head coach Chris Casey, played their home games at the Gallagher Center in Lewiston, New York as members of the Metro Atlantic Athletic Conference. They finished the season 19–14, 12–6 in MAAC play to finish in third place. They lost in the quarterfinals of the MAAC tournament to Fairfield. They were invited to the CollegeInsider.com Tournament where they lost in the first round to Eastern Michigan.