2019–20 AFC Wimbledon season

The 2019–20 season was the fourth in League One, the third tier of the English football league system, for AFC Wimbledon since their promotion in 2016 from League Two. Along with competing in League One, the Kingston upon Thames-based club participated in three cup competitions, the FA Cup, EFL Cup and EFL Trophy, failing to progress past the first stage of any of them.

Pre-season
Dons announced pre-season friendlies against Wexford, Brentford, Bristol City, 1. FC Kaiserslautern, Kickers Offenbach, Bournemouth, Metropolitan Police, Hampton & Richmond Borough and Crystal Palace.

Matches
On Thursday, 20 June 2019, the EFL League One fixtures were revealed.

FA Cup
The first round draw was made on 21 October 2019.

EFL Cup
The first round draw was made on 20 June.

EFL Trophy
On 9 July 2019, the pre-determined group stage draw was announced with Invited clubs to be drawn on 12 July 2019.