The 2020–21 Spartan South Midlands Football League season was the 24th in the history of Spartan South Midlands Football League, a football competition in England. The league operates three divisions, two of which are in covered in this article, the Premier Division, at Step 5 and Division 1 at Step 6 of the English football league system. The allocations for Steps 5 and 6 for season 2020–21 were announced by the FA on 21 July, and were subject to appeal.