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.

Washington's 3rd congressional district encompasses the southernmost portion of Western Washington. It includes the counties of Lewis, Pacific, Wahkiakum, Cowlitz, Clark, and Skamania; as well as a small portion of southern Thurston county. The district is represented by Democrat Marie Gluesenkamp Perez.