Mar-Kell

Mar-Kell
Sire	Blenheim
Grandsire	Blandford
Dam	Nellie Flag
Damsire	American Flag
Sex	Filly
Foaled	1939
Country	United States
Colour	Bay
Breeder	Calumet Farm
Owner	Calumet Farm
Trainer	Ben A. Jones
Record	53: 17-17-3
Earnings	US$84,365
Major wins
Spinaway Stakes (1941) Beldame Handicap (1943) Top Flight Handicap (1943)
Awards
American Champion Older Female Horse (1943)

Mar-Kell (1939–1966) was an American Champion Thoroughbred racehorse. Her dam was the 1934 American Champion Two-Year-Old Filly Nellie Flag, and her sire was the 1930 Epsom Derby winner Blenheim, who had been imported to the United States in 1937 by a syndicate that included Mar-Kell's breeder, Calumet Farm.

Mar-Kell was bred in Kentucky and was raced by Calumet Farm for four years, from age two through five. Trained by future U.S. Racing Hall of Fame inductee Ben Jones, as a four-year-old, Mar-Kell was named American Champion Older Female Horse honors.

After she was retired to broodmare duty, Mar-Kell produced the Calumet runner Mark-Ye-Well. Foaled in 1949, the colt won multiple important stakes races, including the Arlington Classic, American Derby, Lawrence Realization Stakes, and Santa Anita Handicap.

Mar-Kell died in 1966 at age twenty-seven and was buried in the equine cemetery at Calumet Farm.