Katherine Moore Porter is an American politician, law professor, and lawyer who has been the U.S. representative from California's 47th congressional district since 2023, previously representing the 45th congressional district from 2019 to 2023. She was elected as part of a Democratic wave in Orange County flipping the 45th district, covering much of south-central Orange County, including Irvine, Tustin, and Lake Forest along with large portions of Anaheim and Laguna Niguel. In 2022, she was reelected in the 47th congressional district following redistricting. In 2023, Porter announced her candidacy for the U.S. Senate, foregoing reelection to the House of Representatives. She was defeated after failing to advance from the nonpartisan primary won by Adam Schiff and Steve Garvey.