|Full name||William Joseph Barr|
|Date of birth||21 January 1969|
|Place of birth||Halifax, England|
|Playing position||Full back|
|2002||Carlisle United (Caretaker Manager)|
|2006-2010||Preston North End (First Team Coach)|
|2010-2011||Sheffield Wednesday (First Team Coach)|
|2011-2014||Wrexham F.C (Assistant Manager)|
|2014||Wrexham F.C (Caretaker Manager)|
|* Senior club appearances and goals counted for the domestic league only.
† Appearances (Goals).
William Joseph "Billy" Barr (born 21 January 1969 in Halifax, England) is an English former footballer and manager. He took up the post of caretaker manager at Wrexham after the departure of Andy Morrell as manager, but failed to secure the position permanently.
Barr started his career with Halifax Town in July 1987, after coming through the club's youth team. He joined Crewe Alexandra in June 1994. He then moved to Carlisle United in August 1997, and finished his playing career with the club.
He was caretaker manager of Carlisle United from April – August 2002. He later took up a new coaching role with the first team squad at Preston North End, holding the position of first team coach from the summer of 2006.
Towards the end of September 2011 he was asked and agreed to join the revolution at the 'fans owned' club of Wrexham FC and assist player/manager Andy Morrell. A management team of Morrell, Barr and Michael Oakes took Wrexham to second in the league in the 2011/2012 season, finishing on a record 98 points for a second place team. They went on to lose in the play-offs to Luton Town. The following year they took Wrexham to Wembley for the first time in their history, winning the FA Trophy, beating Grimsby Town on penalties. A month and a half later they returned to Wembley, but lost 2-0 to Newport County in the play-off Final.
The following season was a disappointment as Wrexham lost numerous games at the beginning of the season, including 2-0 at home to local rivlals Chester. This led the fans to have a lack of belief in manager Andy Morrell, and after a 1-0 home loss to Barnet he resigned, leaving Barr as caretaker manager. Barr confirmed he had applied for the job although lost his first game 5-0 to Luton. Barr left Wrexham with immediate effect on 19th March 2014 after failing to get the managerial job on a permanent basis
- "Billy Barr". Soccerbase. Retrieved 2007-10-03.
- "Billy Barr's managerial career". Soccerbase. Retrieved 2007-10-03.