The 2019–20 Green Bay Phoenix men's basketball team represented the University of Wisconsin–Green Bay in the 2019–20 NCAA Division I men's basketball season. The Phoenix, led by fifth-year head coach Linc Darner, played their home games at the Resch Center in Ashwaubenon, Wisconsin and the Kress Events Center in Green Bay, Wisconsin as members of the Horizon League. They finished the season 17–16, 11–7 in Horizon League play to finish in third place. They defeated Oakland in the quarterfinals of the Horizon League tournament before losing in the semifinals to Northern Kentucky.