Morris Twelve is a model of Morris car introduced without fanfare in the autumn of 1934 as little more than a larger engined Morris Ten Four for which just another £5 was asked. The chassis and body were of the slow-selling longer wheelbase Ten Six. The engine though awarded a tax rating of 11.98 hp had a cubic capacity of 1548cc compared with Morris's 1292cc (10 hp) Ten Four and 1378cc (12.09 hp) Ten Six.

Morris Motors Limited was a British privately owned motor vehicle manufacturing company formed in 1919 to take over the assets of William Morris's WRM Motors Limited and continue production of the same vehicles. By 1926 its production represented 42 per cent of British car manufacture—a remarkable expansion rate attributed to William Morris's practice of buying in major as well as minor components and assembling them in his own factory. Largely self-financed through his enormous profits, Morris did borrow some money from the public in 1926, and later shared some of Morris Motors' ownership with the public in 1936. The new capital was then used by Morris Motors to buy many of his other privately held businesses.