Mathias Gydesen

{{short description|Danish swimmer}}

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| birth_date = {{Birth date and age|1988|8|24}}

| birth_place = Allerød, Denmark

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| strokes = Backstroke

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Mathias Gydesen (born 24 August 1988) is a Danish swimmer.{{refn|name=OlympicBotGeneratedRef|{{cite web|title=Mathias Gydesen|url=http://www.london2012.com/athlete/gydesen-mathias-1068224/|work=London 2012|publisher=The London Organising Committee of the Olympic Games and Paralympic Games Limited|accessdate=13 September 2012|url-status=dead|archiveurl=https://web.archive.org/web/20120807120650/http://www.london2012.com/athlete/gydesen-mathias-1068224/|archivedate=7 August 2012}}}}{{Cite web|url=https://www.sports-reference.com/olympics/athletes/gy/mathias-gydesen-1.html|archive-url=https://web.archive.org/web/20200418093128/https://www.sports-reference.com/olympics/athletes/gy/mathias-gydesen-1.html|url-status=dead|archive-date=2020-04-18|title=Mathias Gydesen Bio, Stats, and Results|website=Olympics at Sports-Reference.com|language=en|access-date=2017-09-05}} At the 2012 Summer Olympics he finished 30th overall in the heats in the Men's 100 metre backstroke and failed to reach the semifinals.