Joonas "Jonni" Myyrä (13 July 1892 – 22 January 1955) was a Finnish athlete who competed at the 1912, 1920 and 1924 Olympics.

At the 1920 Olympics, his left arm was fractured in a warm-up accident – the spear thrown by James Lincoln struck Myyrä while he was resting on the grass.

Myyrä successfully defended his javelin title at the 1924 Summer Olympics and then fled to the United States due to his financial problems in Finland.

[4] He threw one officially ratified world record in the javelin, 66.10 meters in Stockholm[1] on 24 August 1919 and several other performances exceeding the official record at the time that were for various reasons not ratified, including his eventual personal best of 68.55 m achieved in San Francisco on 27 September 1925.

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