León Cadogan (29 July 1899 – 30 May 1973) was a Paraguayan ethnologist who made significant contributions to the study of Guaraní language and culture.

They settled in Villarrica, a town with a German-speaking population substantial enough to warrant a newspaper, Villarrica-Actual, that publishes in Spanish and German.

In 1919 he moved to Buenos Aires, and two years later his restless spirit led him to the jungles of Caaguazú, where he worked harvesting yerba maté.

Cadogan was accepted as a member of the Mbya-Guaraní and initiated under the spiritual name of "Tupa Kuchubi Veve" ("One who flies like a whirlwind").

His works were published in academic publications in Paraguay, Uruguay, Mexico, Argentina, Brazil, Austria, France and the USA.

In 1949 President Felipe Molas López appointed him "Protector of Indians", but he later lost favour with the thuggish dictator Alfredo Stroessner who tried to politicize and dismantle the organization protecting the indigenous group.