Russell Dana Feingold is an American politician and lawyer who served as a United States Senator from Wisconsin from 1993 to 2011. A member of the Democratic Party, he was its nominee in the 2016 election for the same U.S. Senate seat he had previously occupied. From 1983 to 1993, he was a Wisconsin State Senator representing the 27th District.

The 2016 United States Senate election in Wisconsin was held November 8, 2016, to elect a member of the United States Senate to represent the State of Wisconsin, concurrently with the 2016 U.S. presidential election, as well as other elections to the United States Senate in other states and elections to the United States House of Representatives and various state and local elections. The primaries were held August 9, 2016.