Costa Coffee is a British multinational coffeehouse company headquartered in Dunstable, United Kingdom and a wholly owned subsidiary of Whitbread PLC. It is the second-largest coffeehouse chain in the world (behind Starbucks) and the largest in the United Kingdom.

Costa Coffee was founded in London in 1971 by the Italian brothers Sergio and Bruno Costa, as a wholesale operation supplying roasted coffee to caterers and specialist Italian coffee shops. It was acquired by Whitbread in 1995, since when it has grown to over 1,700 stores across 28 countries.

Bruno and Sergio Costa founded a coffee roastery in Lambeth, London in 1971, supplying local caterers and coffee shops with their slow-roasted blend mocha Italia. Costa branched out to retailing coffee in 1978, when their first store opened in Vauxhall Bridge Road, London.

In 1995, the business was acquired by Whitbread, becoming a wholly owned subsidiary. In 2009 Costa celebrated the opening of their 1,000th store - in Cardiff. In December 2009, Costa Coffee agreed to acquire Coffee Heaven for £36 million, adding 79 stores in central and eastern Europe. By the end of 2010 the company had overtaken Starbucks in the UK, reaching a 37.6% market share measured by revenues.