Washington's Lottery is the lottery system for the U.S. state of Washington, run by the state government. Its games include Mega Millions, Powerball, Keno, Lotto, Hit 5, Match 4, Pick 3, and scratch games.

The lottery was established 41 years ago in 1982, the bill (H.B. 1251) creating the lottery was passed by the state legislature (House on June 30, 1982 Senate on July 1, 1982) and signed by Governor John Spellman on July 16, 1982. Washington became the sixteenth state with a lottery and only the second in the West, joining Arizona.

It was launched four months later with a one-dollar scratch ticket game titled "Pot O'Gold Instant Lottery," which began on November 15, 1982. What is now Pick 3 began in January 1984, and Lotto six months later in July, with a weekly drawing on Saturday, a second drawing on Wednesday was added on November 18, 1987, and a third on Monday on February 14, 2005.