Diane Mary Martinez (born January 14, 1953) is an American politician who served in the California State Assembly for the 49th district from 1992 until 1998. She is a Democrat. A resident of Monterey Park, Her freshman class was the first elected under 1990 voter approved term limits. Martinez became the first freshman to chair a full standing committee, Elections Reapportionments and Constitutional Amendments. Her committee assignments included Appropriations, Education, Health, Local Government, Public Safety, and Utilities and Commerce.