This article details Millwall's 2008–09 season in League One, Millwall's 83rd season in the Football League and 40th in the third tier.
This will be a list of the significant events to occur at the club during the 2008–09 season, presented in chronological order.
9 August 2009- season begins with a 4–3 loss at Oldham.
12 August 2009- Knocked out in the first round of the League Cup at home to Northampton.
Appearances (starts and substitute appearances) and goals include those in the League One (and playoffs), FA Cup, League Cup and EFL Trophy.
Source: [citation needed]
Only competitive matches
= Number of bookings; 
= Number of sending offs after a second yellow card; 
= Number of sending offs by a direct red card.
EU = if holds or not a European Union passport; Country: when 2 flags, 1st flag = country that plays for internationally, 2nd flag = country of birth; N = number on jersey; P = Position (for position name, pause mouse pointer on abbreviation); Name = Name on jersey (for more extensive name, pause mouse pointer on name); Age = age on the day of the signing; Moving from = only indicate the club the player was playing before start playing for this club in this season, for the type of the moving see Status column; Moving to = only indicates the club the player is going to play next, for the type of the moving see Status column; Ends = when the player's current contract ends; n/a = Not applicable.
Source: Competitions
Source: [citation needed]