This is a list of oilfield service companies – notable[according to whom?] companies that provide services to the petroleum exploration and production industry but do not typically produce petroleum. In the list, notable subsidiary companies and divisions are listed as sub-lists of their current parent companies.
Oilfield service companies may produce, maintain, and repair equipment used in oil extraction and oil transportation. In 2019, the global oilfield services market was US $ 267.8 billion.