The Lotus 97T was a Formula One racing car designed by Gérard Ducarouge and built by Team Lotus. A development of the Lotus 95T of 1984, it was designed for the 1985 Formula One season by French engineer Gérard Ducarouge. The 97T was powered by the turbocharged 1.5L Renault engine which produced up to approximately 800 bhp (597 kW; 811 PS). Sponsorship came from John Player Special, French oil company Elf (the official oil of engine supplier Renault) and Olympus Cameras, while the car used Goodyear tyres.

The 97T was of a generally simple design, it used elements from the defunct Lotus 96T Indycar project in the aerodynamics with another piece of Lotus design: an early form of bargeboards. These were placed between the front wheels and the side pods improving airflow around the side of the car. Ducarouge also got around the ban on the 'winglets' seen on the rear wings of the 1984 cars by placing them instead on the rear edges of the side pods.

Lotus' major coup for 1985 was signing rising star Ayrton Senna from the Toleman team to replace long time team driver Nigel Mansell who had signed with Williams. Senna, the first driver signed to the team since the death of Colin Chapman, partnered Italian Elio De Angelis who had finished third in the previous season's drivers' championship and had had many promising results with the 95T.

The 97T proved competitive during the season, taking 8 poles, 7 with Senna and 1 with De Angelis, and 3 wins. Senna's first was a brilliant performance in the Portuguese Grand Prix where he won by over a minute in monsoon conditions. His second came in the Belgian Grand Prix at Spa, held in wet/dry conditions. De Angelis added a third win (his 2nd and last win in F1, both for Lotus) at the San Marino Grand Prix after original winner Alain Prost (McLaren) was disqualified an hour after the race finished due to his out of fuel McLaren-TAG being 2 kg underweight.

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