Intel Extreme Masters Season X – San Jose was a video game esports tournament occurring on November 21–22, 2015 in San Jose, California, US. It was the first tournament of 10th season of the Intel Extreme Masters and featured League of Legends and Counter-Strike: Global Offensive tournaments. There was a combined US$175,000 prize pool across both games. In the case of the latter it was the first Counter-Strike event an IEM since IEM Season VI in 2012. Mark Cuban and Brian Krzanich played a charity celebrity exhibition match of League of Legends benefiting The Cybersmile Foundation.

The Intel Extreme Masters (IEM) is a series of international esports tournaments held in countries around the world. These Electronic Sports League (ESL) sanctioned events, sponsored by Intel, as of 2024 currently host events in Counter-Strike 2 and StarCraft II. Other game titles were hosted in the past. The body that owns the league is Turtle Entertainment. The League has operated 17 seasons as of 2023. The highest tier of events, known as Masters Championships, are held in the summer in Cologne, Germany and in the new year in Katowice, Poland and offer the most prize money. Other events, known as Masters events, are held in numerous cities around the globe, which have included Dallas, Shanghai and Sydney.