The 46-year-old will become the fifth Italian to manage the Blues following in the footsteps of Gianluca Vialli, Claudio Ranieri, Carlo Ancelotti and Roberto Di Matteo.
Conte won three Serie A titles during his time in charge of Juventus and says he is looking forward to life in the Premier League.
“I am very excited about the prospect of working at Chelsea Football Club. I am proud to be the coach of the national team of my country and only a role as attractive as manager of Chelsea could follow that,” he told the club’s official website.
“I am looking forward to meeting everyone at the club and the day-to-day challenge of competing in the Premier League.
“Chelsea and English football are watched wherever you go, the fans are passionate and my ambition is to have more success to follow the victories I enjoyed in Italy.
“I am happy we have made the announcement now so everything is clear and we can end the speculation. I will continue to focus on my job with the Italian national team and will reserve speaking about Chelsea again until after the Euros.”
“We are very pleased to have recruited one of the most highly regarded managers in world football and we are equally pleased to do so before the end of the current season,” she said. “This aids our future planning.
“I would also like to take this opportunity to thank Guus Hiddink, who has done a great job since he joined us in December.”