Grays United F.C. was an English football club based in Grays, Essex. The club played at the Recreation Ground. The club joined Division Two of the Southern League in 1899. In 1900–01 they finished second and qualified for the promotion-relegation test matches. However, after the game against Division One club Watford ended 0–0, Grays refused to play extra time, and were subsequently not promoted. The following season they finished runners-up again, and faced a test-match for a second successive season, this time against Brentford. The match, played at the Memorial Grounds, was drawn 1–1, but the club again refused to play extra time, and were not promoted.