| 2009 Buffalo Bills season | |
|---|---|
 Bills 50th season logo | |
| Owner | Ralph Wilson |
| General manager | Russ Brandon |
| Head coach | Dick Jauron (fired Week 10, 3–6 record) Perry Fewell (interim, 3–4 record) |
| Home field | Ralph Wilson Stadium Rogers Centre |
| Results | |
| Record | 6–10 |
| Division place | 4th AFC East |
| Playoff finish | Did not qualify |
| Pro Bowlers | S Jairus Byrd |
The 2009 season was the Buffalo Bills' 40th season in the National Football League (NFL) the 50th overall and the fourth and final under the head coach Dick Jauron.
The Bills were unable to improve upon their third consecutive 7–9 regular-season record (2006, 2007 and 2008) and failed to make the playoffs for the 10th consecutive year, the longest-standing playoff drought in the NFL which did not end until the 2017 season.
Jauron returned as head coach for a fourth season, the first Bills coach since Marv Levy to receive a contract extension beyond three years. He was fired on November 17 after a 3–6 start and replaced on an interim basis by defensive coordinator Perry Fewell, who was fired at the end of the season but not before starting Ryan Fitzpatrick for the rest of the season.
With the 2009 season, the Bills became one of only two non-expansion teams to not make the playoffs in the 2000s (the other being the Detroit Lions).