|Full name||Keith Derek Millen|
|Date of birth||26 September 1966|
|Place of birth||Croydon, Surrey, England|
|Crystal Palace (assistant manager)|
|2005||Bristol City (caretaker)|
|2010||Bristol City (caretaker)|
|2013||Crystal Palace (caretaker)|
|* Senior club appearances and goals counted for the domestic league only.
† Appearances (Goals).
Millen was appointed as Steve Coppell's successor, after Steve chose to resign from Bristol City and retire from football. Millen spent most of his professional career at Brentford, where he reached the Associate Members' Cup final in 1985, and won the Football League Third Division in 1992. After leaving Brentford in 1994, he finished his playing career with Watford and Bristol City. Following retirement, Millen remained at City as a member of the coaching staff. He was caretaker manager at Ashton Gate following Gary Johnson's departure towards the end of the 2009–10 season. He took charge of nine competitive matches, winning five, drawing three and losing once. He was caretaker manager at Crystal Palace for 4 matches in the 2013-14 season winning one drawing one and losing 2.
|This section requires expansion. (March 2010)|
After spells as an apprentice at Southampton and Crystal Palace, Millen turned professional at Brentford in 1983. He helped Brentford reach the final of the Associate Members' Cup in 1985, where they were defeated 3–1 by Wigan Athletic at Wembley Stadium. He helped the club to the Football League Third Division title in 1991–92, and earned a testimonial match against Tottenham Hotspur in 1993 following ten years as a professional. He joined Watford along with defensive partner Colin Foster in March 1994, helping them escape relegation that season. Although Watford were eventually relegated in 1996, Millen played a part as Watford achieved successive promotions under Graham Taylor between 1997 and 1999. He left Watford later that year to join Bristol City. In the 2000 Auto Windscreens Shield final at Wembley Millen captained the Robins in a 2–1 defeat to Stoke City. He played his last competitive game in August 2002, a 2–0 home win over Blackpool before retiring in 2003.
Coaching and managerial career
Following his retirement from football, Millen became under-17 manager at Bristol City. When Brian Tinnion was promoted to player-manager in 2004, he appointed Millen as his assistant. Under Tinnion's management City won 22 of 61 matches, and Millen was appointed as caretaker when Tinnion left the club. However, he publicly ruled himself out of the running to become the permanent manager. He was made caretaker manager of City when Gary Johnson left the club in March 2010, and became manager on a full-time basis on a three-year contract when Johnson's replacement, Steve Coppell, departed on 12 August 2010. Millen left the manager's position on 3 October 2011.
Millen was appointed Assistant Manager at Crystal Palace in November 2012, following former Blackpool manager Ian Holloway. On 23 October 2013, Millen was appointed as caretaker manager after Holloway left by mutual consent.
On 26 November 2013, newly appointed Crystal Palace manager Tony Pulis announced that Millen will be kept as backroom staff. This is likely because Millen had successfully restored team spirit back into the Crystal Palace squad and inspired Palace to 3 points closer to safety of relegation with 0-0 home draw to Everton, followed by a 0-1 win over Hull City away. 
He is married to Sue and has two children, Amber and Harvey.
Manager of the month
- As of 9 November 2013.
|Bristol City (caretaker)||11 September 2005||26 September 2005||3||1||1||1||33.33|
|Bristol City (caretaker)||18 March 2010||11 May 2010||9||5||3||1||55.56|
|Bristol City||12 August 2010||3 October 2011||57||18||12||27||31.58|
|Crystal Palace (caretaker)||23 October 2013||23 November 2013||4||1||1||2||25.00|
- Trefor Jones (1996). The Watford Football Club Illustrated Who's Who. p. 164. ISBN 0-9527458-0-1.
- Jeremy Hicks. "The Football League Trophy". Rec.Sport.Soccer Statistics Foundation. Retrieved 6 March 2010.
- "Millen takes second in command". Brentford F.C. Retrieved 6 March 2010.
- "PFA list revealed in full". Bristol City F.C. 17 November 2004. Retrieved 6 March 2010.
- "Brian Tinnion's managerial career". Soccerbase. Retrieved 6 March 2010.
- "Millen rules out Bristol City job". BBC Sport. 12 September 2005. Retrieved 6 March 2010.
- "Steve Coppell quits as Bristol City manager". BBC Sport. 12 August 2010. Retrieved 12 August 2010.
- Keith leaves Ashton Gate Bristol City F.C., 3 October 2011 after the 5–0 defeat to Blackpool FC . Retrieved 3 October 2011.
- "SEASIDERS APPOINT MILLEN IN DEVELOPMENT ROLE". 13 July 2012. Retrieved 13 July 2012.
- "Ian Holloway: Crystal Palace boss departs Premier League strugglers". BBC Sport (British Broadcasting Corporation). 23 October 2013. Retrieved 23 October 2013.