Red Bull will be powered by TAG Heuer badged Renault engines next season, the Milton Keynes-based team confirmed on Friday.
Speculation about the deal surfaced on Thursday when the team issued a teaser image on Twitter, suggesting that Swiss engineering would help the team progress in 2016.
Red Bull boss Christian Horner said: "TAG Heuer and Red Bull are two transcendent brands which have both a passion for racing and a drive to do things differently, and this unique collaboration is further evidence of that.
"TAG Heuer has been an icon in the world of Formula 1 for many years and we're delighted that they've chosen to continue their association with the sport by teaming up with us.
"Our shared values of innovation and a desire to stand out from the crowd make this one of the most exciting partnerships in F1.
"We are also pleased to see Renault confirm its long-term commitment to F1 and would like to thank them for their contribution to the team since 2007.
"Their technical partnership with Ilmor gives us confidence, and we look forward to the 2016 season."
The latter comment refers to the prospect of Renault linking up with engine guru Mario Illien to help drive forward development of the French car manufacturer's power unit from next year.