|Date of birth||21 December 1985|
|Place of birth||Cardiff, Wales|
|Height||6 ft 0 in (1.83 m)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 21:57, 3 September 2015 (UTC).
Born in Cardiff, Hart grew up in the Penylan area. He began his career at Bristol City as a youth team player, but after failing to impress enough to gain a professional contract, was released by the club in 2005. He spent the summer working as a labourer and wrote to numerous clubs in The Football League, eventually being offered a trial with Bournemouth. After impressing during the pre-season friendlies, he was offered a short-term contract and found himself in the first-team soon after, making his debut in the first round of the Football League Cup during a 4–3 penalty shoot-out win over Torquay United on 24 August 2005, and then was rewarded with his first start against Chesterfield.
His fine displays were rewarded in February 2006 when he earned a call-up to the Wales under-21 side against Paraguay. Unfortunately, he was unable to play as the south coast club were once again hit with an injury crisis.
Hart was released by Bournemouth on 7 May 2007 and joined Weymouth on non-contract terms in November. He left Weymouth in February 2009. He left Weymouth in February 2009 to join Farnborough. He played just 37 minutes for Boro during a 1–0 win over Banbury United before deciding to seek a professional contract elsewhere.
Hart joined Bath City in October 2009 on non-contract terms. However, he soon left the club and instead signed for Conference South side Weston-super-Mare. He rejoined Bath City prior to the start of the 2010–11 season but then moved on to Salisbury City on 14 March 2011.
After being dogged by injury for the closing months of the season, Hart signed non-contract terms with Salisbury ahead of the 2011–12 season to prove his fitness to the club. After some outstanding performances, and being voted player of the month for August by the Whites fans, he was offered a one-year deal by the club. However, shortly after doing so, he suffered a serious knee injury, ruling him out for the rest of the season.
He returned the following season, and was once again invited to prove his fitness ahead of the season, and was signed on non-contract terms to start with, before being offered a full contract after a successful pre-season period. The 2012–13 season saw Hart feature regularly in the first team, and he started the majority of matches for Salisbury. He signed a new contract ahead of the 2013–14 season.
- "Wales call is hart warming for Callum". South Wales Echo. 8 May 2006. Archived from the original on 11 October 2012. Retrieved 16 August 2010.
- "Torquay 0–0 Bournemouth". BBC Sport. 24 August 2005. Retrieved 16 August 2010.
- "Weymouth sign Young from cherries". BBC Sport. 2 November 2007. Retrieved 16 August 2010.
- "Callum Hart". Farnborough F.C. Retrieved 16 August 2010.
- "Pelecaci different class". The Bath Chronicle. 24 September 2009. Retrieved 16 August 2010.
- "Bath City football club 2010–11". The Bath Chronicle. 12 August 2010. Retrieved 16 August 2010.[dead link]
- Callum Hart agrees Whites Contract