The Wolseley 15/40 was a car of the middle class built by Wolseley from 1921 as a successor to the Wolseley 16/20.

The cars had a 4-cylinder engine with a capacity of 2614 cc and overhead camshafts (OHC). The engine also had water cooling. The car was built on a chassis which was 2997 mm long. The bodies were 4013 mm long.

In 1925 the production was stopped in favour of production of the 16/35.