The 1984Buffalo Bills season was the 25th season for the club and its 15th in the National Football League (NFL). The team started the season with eleven consecutive losses before an upset home win over Dallas in Week 12. The 1984 Bills gave up a team-record 454 points on defense, an average of more than 28 per game. The Bills gave up 30+ points eight times and allowed fewer than 20 points in a game only three times all season. The Bills also allowed 60 quarterback sacks, for a total of 554 yards, the most-ever at the time. The Bills' 4,341 total yards gained was second-worst in the league in 1984 (only the Colts had fewer total yards gained). The 1984 Bills are one of only two NFL teams to have been outscored by 25 points six different times during the season.
For the third time in team history, the Bills changed their helmets. While keeping the streaking buffalo logo from the second change, the Bills changed their helmet color from white to red. They would keep the red helmet through the 2010 season. It was the Bills first major change to their helmets since changing from the "standing Bison" to the streaking buffalo before the 1974 season. Since three of the Bills' four AFC Eastern division opponents—Miami, Indianapolis and New England—had white helmets, "it was easier for [Ferguson] to distinguish and that's the reason why we made the switch." Ferguson had thrown a high number of interceptions over the previous two seasons, and coach Kay Stephenson hoped it would help the quarterback reduce them. Ironically, 1984 was Ferguson's last year with the Bills, and only year with the red helmets; Ferguson, after 107 consecutive starts dating to the 1977 season (at the time tied with the league record), was benched in favor of Joe Dufek on September 30. Ferguson's interception total actually increased compared to the previous year, and he would go on to play for at least three more teams (Tampa Bay Buccaneers, Indianapolis Colts and Canadian football's San Antonio Texans) that all had white helmets.
Notre Dame running back Greg Bell made the Pro Bowl in his rookie season; he was later traded to the Los Angeles Rams in the blockbuster three-team Eric Dickerson trade. Defensive end Sean McNanie played for the team for four of his seven NFL seasons. Punter John Kidd played his first six seasons with Buffalo; his career lasted a total of 15 seasons.