Terrance John Cox is an American politician who served as the U.S. representative for California's 21st congressional district from 2019 to 2021. The son of Chinese American and Filipino American parents, Cox was elected to the House of Representatives in 2018. A member of the Democratic Party, he was defeated in his 2020 rematch with Republican David Valadao.

California's 21st congressional district is a congressional district in the U.S. state of California. It is located in the San Joaquin Valley and includes parts of Fresno County and Tulare County. Cities in the district include the majority of Fresno, the north side of Visalia, and all of Sanger, Selma, Kingsburg, Parlier, Reedley, Orange Cove, Dinuba, Orosi, Cutler, Farmersville, Woodlake and Exeter. The district is currently represented by Democrat Jim Costa.