2019–20 Spartan South Midlands Football League

The 2019–20 season was the 23rd in the history of Spartan South Midlands Football League, a football competition in England.

The allocations for Steps 1 to 6 for season 2019–20 were announced by the FA on 19 May. These were subject to appeal, and the Spartan South Midlands' constitution was ratified at the league's AGM on 22 June.

As a result of the COVID-19 pandemic, the season was formally cancelled on 26 March 2020, with all results from the being expunged, and no promotion or relegation taking place to, from, or within the competition. On 30 March 2020, sixty-six non-league clubs sent an open letter to the Football Association requesting that they reconsider their decision.

Premier Division
The Premier Division featured 15 clubs which competed in the division last season, along with six new clubs.
 * Relegated from Southern League Division One Central:
 * Aylesbury Vale Dynamos, with a name change from Aylesbury
 * Dunstable Town
 * Transferred from the United Counties League:
 * Eynesbury Rovers
 * Newport Pagnell Town
 * Promoted from Division One:
 * Broadfields United
 * Harefield United

Division One
Division One featured 15 clubs in the division for this season, of which there are five new clubs:
 * London Tigers, relegated from the Premier Division
 * New Salamis, promoted from the Hertfordshire Senior County League
 * Shefford Town & Campton, promoted from the Bedfordshire County League
 * St Panteleimon, promoted from the Middlesex County League
 * Stotfold, relegated from the Premier Division

Division Two
Division Two featured 13 clubs which competed in the division last season, along with two new clubs:
 * Buckingham United, joined from the North Bucks & District League
 * Codicote, relegated from Division One