Chicken of the Sea is a brand of canned tuna produced by a company owned by Thai Union International. Based in San Diego, California, the company markets a variety of other seafood items under the Chicken of the Sea brand name, including clam, crab, mackerel, salmon and sardines.

In 2000, Tri-Marine International Inc and Edmund A. Gann sold their 50 percent interest in Chicken of the Sea to Thai Union International, Inc., leaving Thai Union the sole owner of the company.

In 2008 Tri-Union Seafoods, LLC., purchased “Ace of Diamonds” brand in the U.S. from Mitsubishi Corp.