2022–23 Millwall F.C. season

The 2022–23 season was the 138th season in the existence of Millwall Football Club, 96th consecutive season in the Football League, and 46th in the second tier. This was the club's sixth consecutive season in the Championship. In addition to the league where they finished eighth, they competed in the FA Cup and the EFL Cup. The attendance of 18,524 against Sunderland at The Den was the highest since an FA Cup game against Chelsea in 1995. That record was topped a month later against Norwich City, with 18,785 supporters at the Den.

First-team squad
Note: Flags indicate national team as has been defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.

Statistics

 * Players with names in italics and marked * were on loan from another club for the whole of their season with Millwall.

!colspan=14|Players who left the club:


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Pre-season and friendlies
On June 8, Millwall announced their first two pre-season friendlies, against Dartford and Ipswich Town along with a training camp in Republic of Ireland. Two days later, a trip to Colchester United was confirmed. A behind-closed-doors meeting with Crystal Palace was also planned. A fifth friendly match was confirmed in July, against Watford. On 13 July, the club announced they would host Hammarby at The Den in a pre-season meeting.

A mid-season friendly during the 2022 FIFA World Cup winter break against Brøndby was announced.

Matches
On 23 June, the league fixtures were announced.

FA Cup
Millwall were drawn at home to Sheffield United in the third round.

EFL Cup
Millwall were drawn away to Cambridge United in the first round.