The 3½ Litre was a car made by Lagonda in 1935. Only 65 were ever made.

The 3½ Litre used the 10ft 3in M45 Rapide chassis. It was fitted with a 3619cc six-cylinder engine of overhead push-rod design. The engine was fitted with new pistons and alloy con rods. The latest four-speed Lagonda gearbox was used.

The engine produced 88bhp and the top speed of the car was 85mph (137kmh).

The chassis had semi-elliptical leaf-springs all round and the three-litre radiator was fitted. Girling rod-operated brakes were fitted as standard.

Catalogued bodies were a tourer and a saloon.

The tourer cost £1000.

The model was not kept after the receivership.