The 1948 Cleveland Browns season was the team's third in the All-America Football Conference (AAFC). After winning the AAFC crown in 1946 and 1947, the league's first two years of existence, the Browns repeated as champions in 1948 and had a perfect season, winning all of their games. In the 2017 NFL season, the Browns went 0–16, becoming the first and only team in NFL history to have both a winless season and a perfect season.