Joshua Keck Harder (born August 1, 1986) is an American politician and venture capital investor who has served as the U.S. representative from California's 9th congressional district since 2019 (known as the 10th congressional district until 2023). A member of the Democratic Party, he defeated Republican incumbent Jeff Denham in the 2018 election by five points. In 2020, he was reelected by a significantly larger margin than in 2018. He won reelection to California's new 9th congressional district, created through the 2020 redistricting process, which includes the majority of San Joaquin County.