Donald Sternoff Beyer Jr. ( BY-ər; born June 20, 1950) is an American businessman, diplomat, and politician serving as the U.S. representative for Virginia's 8th congressional district since 2015. A member of the Democratic Party, his district is located in Northern Virginia and includes Alexandria, Falls Church, Arlington, and parts of eastern Fairfax County. Beyer has owned automobile dealerships in Virginia and has a long record of involvement in community and philanthropic work. From 1990 to 1998, he served two terms as the 36th lieutenant governor of Virginia during the gubernatorial administrations of Doug Wilder (1990–1994) and George Allen (1994–1998). His party's nominee for governor of Virginia in 1997, he lost to Republican Jim Gilmore, who was then the Attorney General of Virginia. From 2009 to 2013, he served as United States Ambassador to Switzerland and Liechtenstein under President Barack Obama. In 2014, Beyer announced his candidacy for the U.S. House of Representatives seat for Virginia's 8th congressional district held by the retiring Jim Moran. Beyer won the 12-candidate Democratic primary in June with 45% of the vote and went on to win the general election 63% to 33%. He has since been reelected five times, most recently in 2024.