The 1963 Cleveland Browns season was the team's 14th season with the National Football League.
Hall of Fame running back Jim Brown led the league in rushing for the sixth time in seven seasons. This was the year that Brown became the NFL's all-time leading rusher, surpassing Joe Perry. As a team, the 1963 Browns gained an NFL-record 5.74 yards per carry.
There was a doubleheader on August 17, 1963 Giants vs Lions and Colts vs Browns.