Diane Edith Watson is a former American politician who served as US Representative for California's 33rd congressional district, serving from 2003 until 2011, after first being elected in the 32nd District in a 2001 special election. She is a member of the Democratic Party. The district is located entirely in Los Angeles County and includes much of Central Los Angeles, as well as such wealthy neighborhoods as Los Feliz.

California's 33rd congressional district is a congressional district in the U.S. state of California. The district is currently represented by Democrat Pete Aguilar.