Costa Rica’s current leading political parties are:
- National Liberation Party (Costa Rica) (Partido Liberación Nacional—PLN) Founded in 1951 at the end of the civil war. social democratic
- Citizen’s Action Party (Partido Acción Ciudadana — PAC) Founded 2000 by former PLN member; strong showings in 2002 and 2006 elections (30% of Assembly in 2006) Reformist, largely but not exclusively left and center left
- Libertarian Movement Party (Partido Movimiento Libertario — PML). Founded 1994; won 6 Congressional seats (10% of the Assembly) in 2002 and again in 2006 Libertarian
- Social Christian Unity Party (Partido Unidad Social Cristiana—PUSC). Currently less popular than its past, after revelations of corruption, 3 seats in the Assembly Christian democratic
Minor parties with 1 seat in the Assembly:
- Access without Exclusion (Partido Accessibilidad Sin Exclusión—PASE) Fights for disabled people
- Broad Front (Partido Frente Amplio — FA) Left
- National Union Party (Partido Unión Nacional — PUN) Center right
- National Rescue Party (Partido Rescate Nacional)
Minor parties without congressional representation as of 2009:
- Costa Rican Renovation Party (Partido Renovación Costariccense)
- Union for Change Party (Partido Unión para el Cambio)
- National Restoration Party (Partido Restauración Nacional — PRN) Christian
- Homeland First Party (Partido Patria Primero)
Several smaller new parties that participated for the first time in the 2006 elections include Partido Unión Patriótica and Partido Alianza Democrática Nacionalista.