Guillermo Antonio Alejandro Aliaga Pajares (born 28 October 1986) is a Peruvian politician.

In 2015, he began his doctorate studies in law at the Universidad Nacional Mayor de San Marcos.

In 2009, he won a 4-month international scholarship from the Japanese government for the United Nations-sponsored program The Ship for World Youth Leaders (SWYL 2009).

After graduating from this program he was part of the Ship For World Youth Alumni Association (SWYAA), as a speaker at the annual conventions in Egypt and Australia.

[4] Due to the political crisis in the country, he resigned as a member of the board of directors of the Congress of the Republic on November 15, 2020.