Omar Dengo Guerrero (9 March 1888 – 18 November 1928) was a Costa Rican teacher, journalist, writer, lawyer and anarchist.

He worked as a journalist while studying, founding the newspaper Sanción in November 1908 that advocated against the Costa Rican oligarchy and in favour of workers.

The couple would have four children, Jorge Manuel, Omar, Gabriel and María Eugenia and raised them in the city of Heredia.

During the Coto War with Panama he enlisted as a soldier with the Costa Rican military and in 1923 supported the political campaign of Ricardo Jiménez.

[5] In 2008 a conference dedicated to his work was organised by the School of Educational Administration of the University of Costa Rica, led by his daughter Maria Eugenia Dengo Obregon.