The 2015 Pittsburgh Steelers season was the franchise's 83rd season as a professional sports franchise and as a member of the National Football League. It also marked the 16th season under leadership of general manager Kevin Colbert and the ninth under head coachMike Tomlin. For the first time since 2003, safetyTroy Polamalu was not on the opening day roster, as he announced his retirement on April 9.