In 1969, Hanratty was selected in the second round of the NFL Draft by the Steelers' new head coach, Chuck Noll, and was the starting quarterback for a short time before losing the job to the Steelers' No. 1 1970 overall draft pick Terry Bradshaw. Hanratty would be the last Pittsburgh-area native to start a game at quarterback for the Steelers, until Homestead native Charlie Batch would fill in for an injured Ben Roethlisberger for two games during the team's Super Bowl-winning season in 2005. Hanratty suited up for Super Bowl IX, but did not see action.