Charlton Athletic Football Club was founded in 1905 and turned professional in 1920. They joined the English Football League in 1921. The club won their only FA Cup in 1947, having finished as runners-up 12 months earlier. The table details the club's achievements in all national and European first team competitions for each completed season.
^The 1939–40 season was abandoned in early September and all results annulled, after only three matches had been played; Charlton Athletic were eighth in the table at the time.
^No competitive football was played between 1939 and 1946 due to the Second World War.
^The FA Cup was contested in 1945–46 but the Football League did not resume until the following season.
^The 1992–93 season saw the introduction of the Premier League, so Division 1 replaced Division 2, Division 2 replaced Division 3 and Division 3 replaced Division 4.