Mariann Marthinsen (born 9 September 1984) is a Norwegian cross-country skier and swimmer.

[1] During the course of her swimming career, she set 17 world records and won a bronze medal at the 2008 Summer Paralympics in Beijing, China, in the women's 100 metre backstroke S8, and also competed in freestyle races.

Marthinsen had led in the prologue round, and then in her heat but entered the final as the third fastest.

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