| Bentley 4 Litre | |
| Manufacturer: | Bentley Motors Limited |
| Production: | 1931 50 produced |
| Assembly: | Cricklewood, London |
| Class: | Luxury car |
| Body Style: | As arranged with coachbuilder by customer |
| Layout: | Front-engine, rear-wheel-drive |
| Predecessor: | Bentley Speed Six |
| Successor: | Bentley 3.5 Litre |
| Sp: | uk |
The Bentley 4 Litre was a motor car built on rolling chassis made by Bentley Motors Limited in 1931. The 4-litre chassis was conceived and built in a failed attempt to restore Bentley to a good financial state. Announced 15 May 1931, it used a modified four litre Ricardo IOE engine in a shortened 8 Litre chassis at two-thirds of the price of the 8 Litre in an attempt to compete with the Rolls-Royce 20/25. Instead, Bentley went into receivership shortly afterward, from which it was purchased by Rolls-Royce Limited.
The conventional straight-6 engine used an bore and a stroke for a total displacement of and a power output of at 4,000 rpm. The engine power was not suitable for the heavy chassis.