The 1973 Buffalo Bills season was the 14th season for the team and their 4th season in the National Football League (NFL). The Bills finished in 2nd place in the AFC East division and finished the 1973 NFL season with a record of 9–5, the team's first winning record since 1966.
Head coach Lou Saban began the second season of his second tenure with the Bills. Saban had previously led the team to the 1964 and 1965 AFL championships. This was the first season that the team played in Rich Stadium (which changed names over a decade later) after thirteen years playing at War Memorial Stadium ("The Rockpile").
The Bills were returning from 1–13 and 4–9–1 records in 1971 and 1972, respectively.