The Wolseley 20/28 was a midsize car with a four-cylinder engine that Wolseley brought out in 1911.

The cars had a four-block engine with a 4250 cc capacity and lateral vertical valves (sv). The chassis had a wheelbase of 3,277 mm. The bodies were 4420 mm long and 1753 mm wide. The chassis (without construction) weighed 1016 kg. The car was only produced up until 1912.