Frosta AG (stylized as FRoSTA) is a frozen food company headquartered in Bremerhaven, Bremen, Germany. The corporation owns production facilities in Germany and Poland, with sales and distribution subsidiaries in the Czech Republic, Germany, Hungary, Italy, Poland and Romania. It had 1709 employees and revenues of Euro 501 million (USD 581.36 million) in 2017. FRoSTA is the market leader for frozen food in Germany and one of the largest in Europe.

FRoSTA specializes in frozen fish, vegetables, fruits, herbs and ready-to-eat meals in three segments: brand business, private label and foodservice. Its brands include FRoSTA, Elbtal, La Valle Degli Orti, Mare Fresco, Surgela, and tiko. The private label business operates under the FRoSTA and COPACK names, with sales channels to European food retailers such as Aldi, Lidl, and Norma. The foodservice segment focuses on hospitals, catering and industrial customers.

The history of Frosta AG began in 1905 with the founding of Nordstern, a German deep sea fishing company. During the 1970s and 80's frozen food entrepreneur Dirk Ahlers bought several frozen food firms, including Nordstern, and organized them under the holding company "Nordstern Foods." He expanded the business further by acquiring the top East German frozen food brand during German reunification in 1990. The group was renamed FRoSTA AG in 1997 and became an international concern through acquisition of a Unilever manufacturing plant in Poland in 1999.

In 2003, the company became the first frozen food company in Europe to adopt sustainable sourcing and eliminate food additives. This so-called "FRoSTA Purity Standard" was planned to double profitability within 5 years, but instead resulted in the largest losses in company history. The CEO was dismissed and founder Ahlers came out of retirement to lead a turnaround. After adjustments to pricing, brand identity and marketing, net income recovered and FRoSTA became the fastest growing brand in its category by 2013.

The origins of FRoSTA AG can be traced to the founding of deep sea fishing company Nordstern (German: Hochseefischerei Nordstern AG) on January 31, 1905. The company's fleet was based in Geestemünde-Wesermünde, now part of Bremerhaven. Nordstern survived World War I, although 3 of its fishing trawlers were lost due to mines. By the end of 1919, the company had recovered enough assets to build two new buildings and operate 5 vessels.

By 1933, Nordstern was operating 10 trawlers with a total tonnage of 2600GRT in the North Sea, White Sea and North Atlantic around Iceland. At the outbreak of World War II in 1939, the unprepared German Navy requisitioned the company's 12 vessels and converted them for military use. Nordstern resumed fishing operations after the war, but from its pre-war fleet only three ships were left.

In 1954, textile entrepreneur Adolf Ahlers founded a fishing company "Maria von Jewer". His first ship "Sagitta" was commissioned in 1957 with a new technology of onboard filleting and shock freezing, which greatly improved the quality of frozen fish available to customers. Dirk Ahlers, son of Adolf Ahlers, began specializing in frozen fish sales and founded Frosta Handelsgesellschaft mbH in 1961. He expanded by acquiring wholesale fish company F. Schottke (founded 1884) and "FRoSTA" became a registered trademark in 1963. Due to uneconomic fishing quotas, the company abandoned deep-sea fishing and the fleet was sold in 1970.

In the 1970s and ’80s, Ahlers diversified by acquiring both Nordstern AG and Rheintal Tiefkühlkost GmbH (formerly Raiffeisen Tiefkühlkost GmbH), a frozen vegetable and fruits manufacturer in the Rhineland. He merged all subsidiaries into a holding company "Nordstern Foods" (German: Nordstern Lebensmittel AG) in 1988. During German reunification, the Treuhandanstalt assisted the company in the acquisition of Elbtal Tiefkühlkost GmbH, the top frozen food brand of the former German Democratic Republic. The holding company was renamed FRoSTA AG and began selling shares on the Frankfurt Stock Exchange in 1997.