2023–24 Colchester United F.C. season

The 2023–24 season is the 87th season in the history of Colchester United and their eighth consecutive season in League Two. The club are participating in League Two, the FA Cup, the EFL Cup, and the 2023–24 EFL Trophy.

In

 * † Signed for U21's

Pre-season and friendlies
On 9 June, Colchester United announced four pre-season friendlies, against Ebbsfleet United, Peterborough United, West Ham Under Under-21s and Leyton Orient. Six days later, a fifth friendly was confirmed, against Maldon & Tiptree.

Matches
On 22 June, the EFL League Two fixtures were released.

FA Cup
The U's were drawn away to Shrewsbury Town in the first round.

EFL Cup
Colchester were drawn away against Cardiff City in the first round.

EFL Trophy
In the group stage, Colchester United were drawn into Southern Group D along with Cambridge United, Peterborough United and Tottenham Hotspur U21. After finishing second in their group, they were drawn away to West Ham United U21 in the second round.