"I appreciate his efforts over the past five years as the team's offensive coordinator and for helping lead our offense to new heights during his time with the Steelers," head coach Mike Tomlin said in a statement released by the team. "I am grateful to Bruce for contributing to our success and wish him nothing but the best in his retirement."
Pittsburgh's offense this season ranked 12th in yards per game (372.3), but was tied for 21st in points (325).
Arians became the offensive coordinator when Ken Whisenhunt departed for Arizona's head coaching job. He was the Steelers' wide receivers coach for three years (2004-06) prior to his promotion.
The 59-year-old served as Cleveland's offensive coordinator from 2001-03 before joining the Steelers. He also had been an assistant with Indianapolis, New Orleans and Kansas City, and for several college teams. His lone experience as a head coach was at Temple University from 1983-88.