Ottón Solís Fallas (born 31 May 1954 near Pérez Zeledón) is a Costa Rican politician.
He graduated with a Bachelor of Economics from the University of Costa Rica in 1976 and gained a Master's Degree in Economics from the University of Manchester in 1978.
He is currently serving his second term as deputy, was a founding member of the Citizens' Action Party (PAC for its Spanish initials), and ran as its three-time presidential candidate.
As an academic, he has taught at several universities in the United States and Costa Rica.