The 2012–13 Football League Championship was the 127th season in the history of Millwall Football Club. It was their 86th season as a Football League side and their 38th in the second tier of English football. This season marked Millwall's third continuous season in the Championship, after promotion from League One in 2010. This was manager Kenny Jackett's fifth and final season in charge of the club, he resigned at the end of the campaign on 7 May 2013.

Millwall reached the semi-final of the FA-Cup for only the fifth time in their history, losing to Wigan Athletic. In the league, Millwall flirted with the play-offs in the first half of the season, after a 13-game unbeaten run, but they finished poorly and narrowly avoided relegation by two points on the last day of the season.

Millwall kicked off their pre-season campaign with a tour of Ireland, playing in the Republic of Ireland for two games before crossing the border to finish with a match in Northern Ireland. They returned to England for three more away games before the Football League Championship kicked-off.

Last updated: 7 April 2013.
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Last updated: 4 May 2013.
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Ground: A = Away; H = Home. Result: D = Draw; L = Loss; W = Win; P = Postponed.

Sources: For loan start source see "Start source". For loan end source see "End source".
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; No. = 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); In/Out = In: The player came in on loan, Out: The player went out on loan; Loan club = the club that the player moved on loan to or the club that the player came from on loan; Started = the date when the player's loan started; Ended = the date when the player's loan ended.

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