Phase 10 is a card game created by Kenneth Johnson in 1982, and is sold by Mattel. They purchased the rights from Fundex Games in 2010.[1] Phase 10 is based on a variant of rummy known as contract rummy. The game consists of two regular decks of cards. Phase 10 is typically played by two to six people. Phase 10 is named after the ten phases (or melds), which a player must advance through to win.

Phase 10 was Fundex's best selling product, selling over 62,600,000 units as of 2016, making it the 2nd best-selling commercial card game, behind Mattel's Uno.[2] In December 2010, Fundex sold its license rights to Phase 10 to Mattel.

In November 2024, Phase 10 was introduced into the National Toy Hall of Fame