The 2018–19 Portland State Vikings men's basketball team represented Portland State University during the 2018–19 NCAA Division I men's basketball season.

The Vikings, led by second-year head coach Barret Peery, played their return home games at Viking Pavilion in Portland, Oregon after a one year renovation, as members of the Big Sky Conference.

They lost in the quarterfinals of the Big Sky tournament to Weber State.

[1] The Vikings finished the 2017–18 season 20–14, 9–9 in Big Sky play to finish in a tie for sixth place.

They defeated Sacramento State in the first round of the Big Sky tournament before losing in the quarterfinals to Eastern Washington.