It was announced on 25 June 2011 that Campbell, alongside his ex-Raith colleague Kevin Smith, had agreed terms with Dumfries club, Queen of the South.
[7] He made his Queens debut under manager Gus MacPherson on 23 July 2011 in the 2-0 extra-time defeat away to his former club Ayr United in the 2011–12 Scottish Challenge Cup, just one of a number of times where he faced up to his brother Martyn in an opposing team.
[9] Campbell took his first step out of senior football in 14 years when he signed for reigning West of Scotland Super League Premier Division champions Irvine Meadow on 11 February 2012.
Campbell was a regular fixture in the back-line as Chris Strain's side made it back-to-back titles, finishing 5 points ahead of Petershill.
After his contract at Meadow Park expired, Tommy Sloan signed Campbell for West of Scotland Super League Premier Division Champions Auchinleck Talbot in June 2014.
[12] Mark embarked upon a coaching career when he joined Scottish Junior Football Association, West Region side Troon in October 2016.
[14] The two brothers played on the same side for the first time in their professional careers in Martyn's testimonial match at Ayr United's Somerset Park in July 2015.