2020–21 Grimsby Town F.C. season

The 2020–21 season is Grimsby Town's 143rd in existence and their fifth consecutive season in EFL League Two. Along with competing in League Two, the club will also participate in the FA Cup, EFL Cup and EFL Trophy.

The season covers the period from 1 July 2020 to 30 June 2021.

The team struggled through the course of the season with relegation to the National League confirmed on April 27 after a 3-2 loss to Exeter City F.C.

First-team squad

 * Players' ages are as of the opening day of the 2020–21 season (12 September).

Matches
The 2020–21 season fixtures were released on 21 August.

FA Cup
The draw for the first round was made on Monday 26, October.

EFL Cup
The first round draw was made on 18 August, live on Sky Sports, by Paul Merson.

EFL Trophy
The regional group stage draw was confirmed on 18 August.