Marc Brockmann Olsen (born 15 January 1986) is a Danish professional football (soccer) player and Backgammon Grandmaster.

Olsen plays as a midfielder. He has played professionally for Danish clubs including Brøndby IF, and also one season for South Melbourne FC in Australia.

Marc Olsen debuted for Brøndby's first team 5 November 2006 against FC København. His favourite position is as a left midfielder.

Olsen is a G2 Grandmaster in Backgammon,^[3] and an author of books on Backgammon strategy. He also presents the YouTube channel "Backgammon Galaxy", teaching strategies from beginner to advanced level.^{[citation needed]}

Olsen is also the Founder and current CEO of the mobile and web gaming site, Backgammon Galaxy. It is the platform of choice for online Backgammon Master and Grandmaster level players.^{[citation needed]}

• Backgammon: From Basics to Badass (2015)
• Backgammon: Pure Strategy (2017)
• Backgammon - Cube like a boss: Patterns, Intuition & Strategy (2019)

• Marc Olsen national team profile at the Danish Football Association (in Danish)
• Brøndby IF profile (in Danish) at the Wayback Machine (archived 27 September 2007)
• Marc Olsen at DR (in Danish) (archived)

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