Antonio Lacayo Oyanguren (21 December 1947 – 17 November 2015) was a Nicaraguan politician who served as Minister of the Presidency from 1990 to 1996, during the government of Violeta Barrios de Chamorro.

He was campaign manager for Chamorro’s 1990 run for the presidency that defeated FSLN incumbent Daniel Ortega.

[1] In 1995, Lacayo established The National Project (Spanish: Proyecto Nacional - PRONAL), a political party.

[4] However, his candidacy stirred political controversy in Nicaragua, as many politicians contended that the constitution prohibited relatives of current or former presidents from running for office.

Despite leading in the opinion polls, he was disqualified by the Electoral Supreme Council, as it ruled it was unconstitutional for Lacayo to run because he was married to the daughter of then-president Violeta Chamorro.