The 2020–21 Portland State Vikings men's basketball team represented Portland State University in the 2020–21 NCAA Division I men's basketball season. The Vikings, led by fourth-year head coach Barret Peery, played their home games at Viking Pavilion in Portland, Oregon as members of the Big Sky Conference. They finished the season 9-13, 6-8 in Big Sky Play to finish a tie for 7th place. They lost in the first round of the Big Sky tournament to Northern Arizona.