Youppi! (French pronunciation: ​[jupi], French for Yippee!) is the official mascot for the Montreal Canadiens, and former longtime mascot of Montreal Expos (now the Washington Nationals). Youppi! wears an exclamation mark as his jersey number.

Youppi!, a creation of Acme Mascots, Inc. (a division of Harrison/Erickson, Inc.), was commissioned by Expos vice-president Roger D. Landry. Originally leased by the team in 1979, the mascot was eventually purchased by the Montreal Expos baseball team and represented them until they moved to Washington, D.C., after the 2004 season. Youppi! was designed by Bonnie Erickson, formerly a designer for Jim Henson, and the designer of Miss Piggy, Statler & Waldorf and other Muppet characters. The orange, hairy giant was one of the most popular figures among everyone at Olympic Stadium.

Youppi! was the first mascot to be thrown out of a Major League Baseball game: On August 23, 1989, in the 11th inning, while atop the visitors' dugout, Youppi! took a running leap, landing hard and noisily on its roof, and then sneaked into a front row seat. Los Angeles Dodgers manager Tommy Lasorda complained to the umpires and Youppi! was ejected, though he later returned, confined to the home team's dugout roof, as Montreal eventually lost 1–0 in 22 innings. Youppi! was also a frequent joke punchline of notoriously sarcastic Atlanta Braves broadcaster Skip Caray. Youppi! was also referenced by pitcher Bill Lee during interviews in Ken Burns's Baseball documentary.

Youppi! is often referred to as one of only three mascots inducted to the Baseball Hall of Fame. The others are the Phillie Phanatic of Philadelphia, another Erickson design, and the Famous Chicken from San Diego. Although their likenesses can be found in the displays in Cooperstown, their inductions to the Hall of Fame are not considered "official."

On September 16, 2005, the Montreal Canadiens announced that Youppi! would become the first official mascot of the organization, and the first mascot to ever switch between any two major sports leagues in North America. The terms of acquisition were reportedly in the six figures. Youppi! now sports the Canadiens' bleu-blanc-rouge (blue, white, and red) jersey. Youppi!'s first game in the Bell Centre was on October 18, 2005.

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