The club was renamed to Chesterfield FC in December 1920, and became founder members of the Third Division North in 1921–22. They marked their tenth season in the division, 1930–31, by winning the title, though only managed two seasons in the Second Division before suffering relegation. They again won the Third Division North title in 1935–36, and after World War II recorded their best ever league finish of fourth in the Second Division in 1946–47. However they were relegated again in 1950–51, and were relegated out of the Third Division in 1960–61. Chesterfield won the Fourth Division in 1969–70, and then won the Anglo-Scottish Cup in 1980. After relegation in 1982–83, they again won the Fourth Division title in 1984–85, though would again be relegated after five seasons in the third tier. They secured their return to the third tier with a 2–0 win over Bury in the 1995 play-off Final at Wembley.