The 2015 Portland State Vikings football team represented Portland State University during the 2015 NCAA Division I FCS football season.

They were led by first-year head coach Bruce Barnum and played their home games at Providence Park, with one home game at Hillsboro Stadium.

They received an at-large bid to the FCS Playoffs, the Vikings first appearance in the FCS playoffs since 2000, where they lost in the second round to Northern Iowa.

The 59 point margin was the largest margin of victory by an FCS team over an FBS team since the split of NCAA Division I football in 1978 into the groupings now known as FBS and FCS.

[2] On July 17, 2015, the Big Sky Conference released its preseason coaches' and media polls.