The AGA cooker is a stored-heat stove and cooker invented in 1922 by the Nobel Prize-winning Swedish physicist Dr. Gustaf Dalén (1869 - 1937), who also founded the AGA company. The cookers are today manufactured by the Aga Rangemaster Group.

In 1912 Dr. Dalen lost his sight in an explosion while developing his earlier invention aga. Forced to stay at home, Dr. Dalen discovered that his wife was exhausted by cooking. Although blind, he was determined to develop a new stove that was capable of every culinary technique and easy to use. It is also capable of heating a house.

Adopting the principle of heat storage, he combined a small and efficient heat source, two large hotplates and two generous ovens into one robust and compact unit: the AGA Cooker. The cooker was introduced to England in 1929, and its popularity in certain parts of English society (owners of medium to large country houses) led to the term "AGA Saga", referring to a genre of fiction set amongst stereotypical AGA owners.

AGA is an abbreviation of the company name, Aktiebolaget Gas Accumulator.

The iron castings in the cooker are made at Coalbrookdale in Shropshire, the site of Abraham Darby's original iron works where modern iron smelting was invented.