The 2009 Cincinnati Bengals season was the 40th season for the team in the National Football League (NFL) and their 42nd overall. They finished the season at 10–6, and sweeping the entire AFC North division, they improved on their 2008 record of 4–11–1, winning the AFC North Division and making the playoffs for the first time since 2005. Their season ended with a 24–14 loss against the New York Jets in the AFC Wild Card Playoff Round.

Marvin Roland Lewis Jr. is an American football coach who is an assistant head coach of the Las Vegas Raiders of the National Football League (NFL). Previously, Lewis was the head coach of the Cincinnati Bengals for 16 seasons. He came to prominence as the defensive coordinator of the Baltimore Ravens from 1996 to 2001, whose defense in 2000 set the record for the fewest points allowed in a 16-game season and led the franchise to their first Super Bowl title in Super Bowl XXXV. This success resulted in Lewis being named the Bengals' head coach, where he served from 2003 to 2018. He was also a commentator for the Alliance of American Football (AAF).