Openfield is a British grain marketing and arable inputs co-operative based in Lincolnshire. It is one of Britain's largest agricultural companies and Britain's only national co-operative in its field, with a turnover in excess of £500m. It markets grain for farmers and grain stores. In other countries, mainly Canada, this type of company is known as a wheat pool. The head office is based on the former RAF North Witham and prominent customers include Coors UK and Waitrose. Openfield is a member of the , and work with the fertiliser supplier GrowHow UK. It is also a member of the .