The 2018 Bill Beaumont County Championship Division 1 was the 118th version of the annual, English rugby union, County Championship organised by the Rugby Football Union (RFU) for the top tier English counties. Each county drew its players from rugby union clubs from the third tier and below of the English rugby union league system (typically National League 1, National League 2 North or National League 2 South). The counties were divided into two regional sections (each divided into two pools, for a total of four) with the winners of each meeting in the final held at Twickenham Stadium. Lancashire are the reigning champions having defeated Cornwall in the previous year's final.