The 1949 Cleveland Browns season was the team's fourth and final season in the All-America Football Conference (AAFC). The Browns finished the regular season with a 9–1–2 win–loss–tie record and beat the San Francisco 49ers to win their fourth straight league championship. In the season's sixth game on October 9, the 49ers stopped the Browns' professional football record unbeaten streak at 29 games. It began two years earlier on October 19, 1947, and included two league championship games and two ties.
Cleveland made numerous roster moves before the season, adding tackle Derrell Palmer, linebacker Tommy Thompson, and defensive back Warren Lahr, all of whom remained with the team for many years. Prior to the season, it was clear that the AAFC was struggling and might not survive beyond 1949. The regular season was shortened to twelve games and a new playoff system was introduced, with the top four teams competing in a two-week (semifinals, final) postseason.
The Browns began the season with a tie against the Buffalo Bills, but won their next four games. Following their loss to the 49ers in the sixth game of the season, the Browns won all but one of their remaining regular-season games, another tie with the Bills. The team finished atop the AAFC standings and faced the Bills in a league semi-final that they won, 31–21. The Browns then beat the 49ers in the championship game, shortly after AAFC and National Football League (NFL) owners agreed to a deal where the Browns, 49ers, and Baltimore Colts would join the NFL in , and the rest of the AAFC teams would cease to exist.
Browns quarterback Otto Graham, end Mac Speedie, and linebacker Lou Saban were named to sportswriters' All-Pro lists after the season, while head coach Paul Brown was named AAFC coach of the year by Sporting News. Graham led the league in passing for the third time in a row, while Speedie was the league leader in yards and receptions. Fullback Marion Motley was the AAFC's all-time leading rusher. While the Browns were successful in the AAFC, winning all four of its championships, many people doubted that they could match up against NFL teams. Cleveland went on to win the 1950 NFL championship.
Offseason and roster moves
The Browns finished the 1948 season with a perfect record and defeated the Buffalo Bills to win the AAFC championship for the third time in a row. Head coach Paul Brown made several adjustments before the 1949 season, bringing in halfback Les Horvath, a former Los Angeles Rams player from Ohio State who had won the Heisman Trophy in 1944 . He also signed tackle Derrell Palmer and linebacker Tommy Thompson. Palmer came in a trade with the New York Yankees and Thompson, a rookie from William & Mary, helped solidify the team's defense for the next five seasons. Defensive back Warren Lahr, who had signed in 1948 out of Western Reserve but sat out the season with a broken leg, saw his first play in 1949 and was a star in the secondary for eleven years.
Even before the season began, signs had emerged that the AAFC was struggling financially. After suffering from poor attendance in the previous season, the Brooklyn Dodgers dissolved and some of its players joined the cross-town New York Yankees as part of a partial merger. Other AAFC teams were allowed to sign players who did not join the Yankees, and the Browns added tackle Joe Spencer. Team owners agreed to several other changes in an attempt to address the league's difficulties. The regular-season schedule was reduced from 14 to 12 games, and the Eastern and Western divisions were abandoned in favor of a single set of standings, with the top four teams participating in playoffs to determine the league champion. The team with the better regular-season record had home-field advantage in the playoffs, the first time that happened in professional football history.
Paul Brown and other AAFC coaches knew the league was unlikely to survive after the 1949 season. AAFC owners had already discussed merging with the National Football League (NFL) the previous year, and most teams in both leagues were losing money. The talks fell apart, however, when the owners could not agree on which of the AAFC's teams would join the NFL. As the league faltered, Brown entertained but ultimately declined offers to leave the Browns and return to Ohio State University, where he had coached in the early 1940s.
Roster and coaching staff
Preseason
Preseason game summaries
The Browns held their training camp at Bowling Green State University in Bowling Green, Ohio, as the team had each year since its first season in 1946. Three preseason games were scheduled, against the Chicago Hornets, San Francisco 49ers and New York Yankees.