Constantino León López (born April 12, 1974 in Pampas, Huancavelica) is a Peruvian marathon runner.

[1][2] He set a personal best time of 2:17:03, by finishing eleventh at the 2010 Chosunilbo Chunchon International Marathon in Chuncheon, South Korea.

[3] Leon represented Peru at the 2008 Summer Olympics in Beijing, where he competed for the men's marathon.

He successfully finished the race in sixty-first place by ten seconds ahead of Montenegro's Goran Stojiljković, with a time of 2:28:04.

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