The Wolseley Twelve was a midsized car introduced in 1938. It was a four-cylinder version of the Fourteen.

The cars had a four-cylinder inline engine with a 1548 cc capacity and overhead valves (OHV). The power output was 44 bhp (32 kW) at 4,000rpm.

The 4-door sedan was built on a chassis with a 2489 mm wheelbase. The completed car was 4140 mm long and 1702 mm wide. The car weight was 1321 kg, the maximum speed was 101 km/h.

In 1948, the car was replaced with the 4/50.