Laing O'Rourke is a multinational construction company headquartered in Dartford, England. It was founded in 1978 by Ray O'Rourke. It is the largest privately owned construction company in the United Kingdom.

John Laing Group plc is a British investor, developer and operator of privately financed, public sector infrastructure projects such as roads, railways, hospitals and schools through public-private partnership (PPP) and private finance initiative (PFI) arrangements. It was listed on the London Stock Exchange and was a constituent of the FTSE 250 Index prior to its acquisition of the company by the American private equity firm Kohlberg Kravis Roberts (KKR).