ALDI Einkauf GmbH & Co. oHG, doing business as  ALDI, short for "Albrecht Discount", is a global discount supermarket chain based in Germany. The chain is made up of two separate groups, ALDI Nord (North - operating as ALDI MARKT), with its headquarters in Essen and ALDI Süd (South - operating as Aldi Süd), with its headquarters in Mülheim an der Ruhr, which operate independently from each other within specific areas.

The individual groups were originally owned and managed by brothers Karl Albrecht and Theo Albrecht; Karl Albrecht retains ownership of Aldi Süd, and with a personal wealth of €17.2 billion, is the richest man in Germany, while the co-owners of Aldi Nord, Berthold and Theo Albrecht Jr., follow close behind at €16 billion. Dieter Schwarz, owner of Lidl and Kaufland came in third, with a fortune of €11.5 billion.Theo Albrecht was Germany's second-wealthiest person at his death in July 2010.

Aldi stores worldwide: Aldi Nord in blue, Aldi Süd in orange. Not shown is Trader Joe's in the U.S., which belongs to Aldi Nord

Aldi's German operations consist of Aldi Nord's 35 individual regional companies with about 2,500 stores in western, northern, and eastern Germany, and Aldi Süd's 31 regional companies with 1,600 stores in western and southern Germany. Internationally, Aldi Nord operates in Denmark, France, the Benelux countries, the Iberian peninsula, and Poland