Ubisoft Entertainment (formerly Ubi Soft) is a French computer and video game publisher and developer with headquarters in Montreuil-sous-Bois, France. The company has facilities in over 20 countries, including development studios in Montreal and Québec City, Quebec, Canada; Barcelona, Spain; Shanghai, China; Singapore; North Carolina, USA; Düsseldorf, Germany; Sofia, Bulgaria; Bucharest, Romania; Casablanca, Morocco; Sydney, Australia and Milan, Italy, amongst other locations.

As of 2004, it was the third-largest independent video game publisher in Europe, and the seventh largest in the United States. Ubisoft's revenue for 2002-2003 was €453 million; for fiscal year 2003-2004, this grew to €508 million. As of 2005, Ubisoft employed more than 3,500 people, of which over 1,700 are classed as working in production. The company's largest development studio is Ubisoft Montreal, which in 2004 employed approximately 1,600 people. Yves Guillemot, a founding brother, was the chairman and CEO.