Álvaro de Soto (born 16 March 1943) is a Peruvian diplomat and a senior official of the United Nations.
De Soto studied law and international relations in Lima and Geneva prior to enlisting in his country's diplomatic corps. Prior to his secondment to the United Nations, he worked for Peru's foreign ministry in Lima and at its UN missions in New York City and Geneva.
In 1982 he joined the United Nations staff as a special adviser to Secretary-General Javier Pérez de Cuéllar. Following his appointment as the Secretary-General's Personal Representative for the Central American Peace Process, Ambassador de Soto headed the 1990-1991 negotiations that brought an end to the decade-long civil war in El Salvador.
He was a Senior Political Adviser to Secretary-General Boutros Boutros-Ghali from February 1992 to December 1994. He then served as Assistant Secretary-General for Political Affairs, in charge of the Americas, Europe, Asia, and the Pacific, from 1995 to 1999. In 1997 Secretary-General Kofi Annan chose him as his Special Envoy for Myanmar, a position he held until 1999.
On 1 November 1999 de Soto was selected as the Secretary-General's Special Adviser on Cyprus, with the rank of Under-Secretary-General; he held this post until the dismantling of the Special Mission to Cyprus following the April 2004 rejection of the Annan Plan for Cypriot reunification.