Martinus Lørdahl (28 July 1873, in Hof, Vestfold – 2 April 1933, in Oslo) was a Norwegian businessperson, multi sports competitor and sports administrator.

He co-founded the sports club Kristiania Idrætsforening in 1893, and participated in restarting Christiania Skøiteklub in 1898.

He served as President of the Norwegian Swimming Federation from 1920 to 1923, and co-founded Oslo Idrettskrets [no].

[1] A bust of Lørdahl, sculpted by Per Ung, was unveiled at Bislett Stadium in 2010.

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