Under the three-season deal, Lucozade Sport's full range of 26 nutritional products will be available to Carlo Ancelotti's team before, after and during their matches.
Lucozade Sport scientists will also work closely with the side's backroom staff at the training ground in Cobham.
Ben Wells, head of marketing for Chelsea, said: "Lucozade Sport has an unrivalled heritage in the world of sports nutrition, so it’s a natural fit for Chelsea as we aim for further honours this season.
"Working with Lucozade Sport means that our players have access to safe products that are proven to make a difference."
Lucozade Sport has been the official sports drink of the Premier League since its inception in 1992.
Last week the club signed up Thai brand Singha as its official beer sponsor in a four-year deal. The beer will be sold exclusively across the club's Stamford Bridge venue.
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