Wallace Humphrey White Jr. was an American politician and Republican leader in the United States Congress from 1917 until 1949. White was from the U.S. state of Maine and served in the U.S. House of Representatives before being elected to the U.S. Senate, where he was Senate Minority Leader and later Majority Leader before his retirement.

The positions of majority leader and minority leader are held by two United States senators and people of the party leadership of the United States Senate. They serve as a chief spokespersons for their respective political parties holding the majority and the minority in the United States Senate. They are each elected as majority leader and minority leader by the senators of their party caucuses: the Senate Democratic Caucus and the Senate Republican Conference.