Oscar Rodriguez graduated elementary course in San Pablo Elementary School and is an alumnus of Pampanga High School. Rodriguez began his career in law as a stenographer in Toledano Colleges (now East Central Colleges) before graduating from Pampanga’s Harvardian Colleges with a Bachelor of Arts degree in 1969 and with a law degree from Far Eastern University in 1973.
He is currently the President of the League of Cities of the Philippines, Chairman of the Regional Development Council of Central Luzon and Vice President of the Union of Local Authorities of the Philippines. He is the founding president of the group MAYAP (Movement for the Advancement of Young Advocates of Pampanga) and was a prosecutor during the impeachment trial of former President Joseph Estrada. Rodriguez is also the representative of 3rd District of Pampanga from 1987–1992 and again from 1995-2004.
He authored several laws, including: The Republic Acting 8990, an act that converted the Municipality of San Fernando, Pampanga into a component city that is now known as the City of San Fernando The Republic Acting 9225, The Dual Citizenship Law providing for overseas Filipinos to participate in political processes The Republic Acting 9211, The Tobacco Regulation Acting of 2003 The Republic Acting 9173 which seeks to strengthen the Nursing Profession in the Philippines He has also authored bills that seeks prohibition of political dynasties and amendments to the illegal discharge of firearms.
In 2005 he was one of the finalists for World Mayor.
He was formerly a member of Lakas-Kampi-CMD but switched to Liberal Party during the 2010 Philippine general elections.
