Otto Guevara Guth (born 13 October 1960) is a politician in Costa Rica and founder of the Partido Movimiento Libertario (Libertarian Movement Party).

First elected to congress as the sole representative for the Movimiento Libertario in 1998, Guevara earned recognition as Costa Rica’s best legislator by the press every year of his first term.

In 2002, Libertarian Movement, with Guevara as the presidential candidate, elected 6 members to Congress out of 57 seats, but few weeks later they lost a Congressman, declared independent.

On election day, Guevara was involved in a religious controversy, as his girlfriend Deborah Formal was seen on national television pocketing part of the host after receiving Eucharist at Catholic Mass.

[1] Guevara signed the Madrid Charter, a document drafted by the conservative Spanish political party Vox that describes left-wing groups as enemies of Ibero-America involved in a "criminal project" that are "under the umbrella of the Cuban regime".