Óscar Rafael de Jesús Arias Sánchez (born 13 September 1940) is a Costa Rican politician who was President of Costa Rica from 2006 to 2010. He previously served as President from 1986 to 1990 and received the Nobel Peace Prize in 1987 for his efforts to end civil wars then raging in several other Central American countries.
He is also a recipient of the Albert Schweitzer Prize for Humanitarianism and a trustee of Economists for Peace and Security. In 2003, he was elected to the Board of Directors of the International Criminal Court's Trust Fund for Victims.
He is a member of Collegium International, an organization of leaders with political, scientific, and ethical expertise whose goal is to provide new approaches in overcoming the obstacles in the way of a peaceful, socially just and economically sustainable world.