The 2015–16 Portland State Vikings men's basketball team represented Portland State University during the 2015–16 NCAA Division I men's basketball season.

The Vikings, led by seventh year head coach Tyler Geving, played their home games at the Peter Stott Center and were members of the Big Sky Conference.

They defeated Northern Colorado in the first round of the Big Sky tournament to advance to the quarterfinals where they lost to Weber State.

The Vikings finished the season 15–14, 9–9 in Big Sky play to finish in sixth place.

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