The Lotus 97T was a Formula One racing car designed by Gérard Ducarouge and built by Team Lotus for use in the 1985 Formula One World Championship. A development of the previous year's 95T, the car was powered by the turbocharged 1.5-litre Renault EF15B V6 engine and ran on Goodyear tyres. John Player Special continued as the team's title sponsor, with Elf and Olympus as secondary sponsors.