The Cheltenham Guardians Safeguarding Team Mares' Open National Hunt Flat Race is a Listed National Hunt flat race in Great Britain which is open to fillies and mares aged four or five years. It is run on the Old Course at Cheltenham over a distance of about 2 miles and ý furlong (2 miles and 87 yards, or ), and it is scheduled to take place each year in November. The race has been run under various names since its inception. Prior to 2023 the race was also open to six-year-olds.