Folke Frithiof Martens Mårtensson (19 May 1884 – 20 June 1956) was a Greco-Roman wrestler from Sweden.

[1] He won the middleweight contests at the 1908 Summer Olympics in London and at the unofficial 1909 European Championships in Malmö.

[2][3] After 1909 Mårtensson moved to Copenhagen for training as a dental technician and in 1913 to the United States.

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