Otto Guevara Guth (born 13 October 1960) is a politician in Costa Rica and founder of the Partido Movimiento Libertario (Libertarian Movement Party).
He served in the Costa Rican legislature from 1998-2002 and 2014-2018.
Guevara is currently the president of the Libertarian Movement Party and has been its candidate for president of Costa Rica in 2002, 2006, 2010 and 2014.