Martti Bertil Marttelin (18 June 1897 – 1 March 1940) was a long-distance runner from Finland, who competed at the 1928 Summer Olympics.

[1] Marttelin won the bronze medal in the men's marathon at the 1928 Summer Olympics.

Marttelin finished second behind Dunky Wright in the marathon event at the British 1930 AAA Championships.

[3][4][5] He was killed in action during World War II.

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