Peko, 6-foot-3, 322 pounds, is in his ninth season with the Bengals. He started every game last season, ranking second among defensive linemen in tackles while also recording a career-high three sacks.
Peko was a fourth-round pick by the Bengals in 2006 out of Michigan State.
“Domata has been a significant and productive player for our defense for many years now, and we are excited to extend his time here even longer,” Bengals head coach Marvin Lewis said in a release. “He is a leader among our veterans and a mentor for our younger players, and securing his future as a Bengal through the next three seasons is another positive step in continuing to improve our team.”