Guillermo José Lovell (January 14, 1918 – October 25, 1967) was an Argentine heavyweight boxer.

He competed at the 1936 Berlin Olympics and won a silver medal, losing by points to Herbert Runge in the final.

His elder brother Alberto Lovell and nephew Pedro were also Olympic boxers.

[1] Below are Guillermo Lovell's bouts from the 1936 Olympic boxing tournament in Berlin.

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