Manolo J. Diaz (born July 4, 1953, in San Francisco, California) is an American engineer and politician who served as a member of the California State Assembly from 2000 to 2004, representing the 23rd District. He left his seat in 2004 to make an unsuccessful run for the California State Senate. Diaz served as a member of the a San Jose City Council from 1995 to 2000 prior to joining the Assembly.