Torsten Gustav Magnus Henning Grönfors (8 August 1888 – 28 May 1968) was a Swedish sailor and tennis player who competed in the 1912 Summer Olympics.

[1] He was a crew member of the Swedish boat R. S. Y. C., which finished fifth in the 8 metre class competition.

[2][3] In the men's singles indoor tennis tournament, he was eliminated in the round of 16 by Anthony Wilding, who later won the bronze medal.

[2][3] In the outdoor men's doubles event, he and his partner Frans Möller were eliminated in the first round.

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