Limitryu Tupaq Yupanki (Spanish Demetrio Túpac Yupanqui Martínez) (22 December 1923 – 3 May 2018) was a Peruvian Quechua language professor (or more accurate Southern Quechua), a translator from Castilian to Quechua^[1] and journalist.

He went to Lima, where he studied Philosophy at the Pontifical Catholic University of Peru, and then Law at the National University of San Marcos.^[2] He worked in the newspaper La Prensa, and began teaching Quechua. Subsequently, he opened his own academy, Yachay Wasi. He also taught in the United States.^[3]

In November 2005, thanks to his work, the Quechua translation of the Spanish classic Don Quixote de la Mancha was finally published with the name Yachay sapa wiraqucha dun Qvixote Manchamantan^[4]

In 2008, his work The Quechua Course was translated into Russian by A. Skromnitsky. He died on May 3, 2018.^[5]