Susan Carol Davis (née Alpert; born April 13, 1944) is a former American politician who served as the U.S. representative for California's 49th congressional district for one term and California's 53rd congressional district for nine terms from 2001 to 2021. She is a member of the Democratic Party. Her district included central and eastern portions of the city of San Diego, as well as eastern suburbs such as El Cajon, La Mesa, Spring Valley, and Lemon Grove.