The lieutenant governor of Washington is an elected office in the U.S. state of Washington. The incumbent is Denny Heck, a Democrat who began his term in January 2021. The lieutenant governor serves as president of the Washington State Senate, fills in as acting governor whenever the governor leaves the state or is unable to serve, and assumes the duties of governor in case of a vacancy.

Dennis Lynn Heck is an American entrepreneur and politician serving as the 17th lieutenant governor of Washington. A member of the Democratic Party, he previously served as the U.S. representative for Washington's 10th congressional district from 2013 to 2021 and as a state representative from 1977 to 1985.