Diane Edith Watson (born November 12, 1933), American politician, has been a member of the United States House of Representatives since 2001. She represents California's 33rd congressional district (map). It is entirely in Los Angeles County and includes much of Central Los Angeles, including some wealthy neighborhoods such as Los Feliz. She ran unopposed in the 2006 mid-term election.

Born in Los Angeles, California, Watson was raised Catholic. She was educated at Dorsey High School, Los Angeles City College and the University of California, Los Angeles, where she earned her BA in Education (1956). Watson became a member of Alpha Kappa Alpha.

She earned an MS from California State University, Los Angeles in School Psychology (1987) and a PhD in Educational Administration from Claremont Graduate University the same year. She also attended the Kennedy School of Government at Harvard University. Watson taught elementary school and was a school psychologist in the Los Angeles public schools. She has lectured at California State University, Long Beach and California State University, Los Angeles. She was a health occupation specialist with the California Department of Education's Bureau of Industrial Education.