Richard E. "Dick" Dutrow, Sr. (March 8, 1937 - February 19, 1999 was an American Thoroughbred racehorse trainer. Dutrow, along with King T. Leatherbury, John J. Tammaro, Jr. and Hall of Fame inductee Bud Delp, were known as Maryland racing's "Big Four". They dominated racing in that state during the 1960s and '70s and helped modernize flat racing training.

Richard Dutrow, Sr. began training race horses in the 1950s. Living in Hagerstown, Maryland, where his son Richard Jr. was born in 1959, his success at the small half-mile track in his hometown plus at others in such places as Bel Air, Upper Marlboro and Cumberland as well as at Waterford Park in Chester, West Virginia led to his moving to the larger tracks on the Maryland racing circuit. For many years Dutrow concentrated on making a living through winning as many races as possible through his astute horse selection and his training methods. However, later in his career he competed on the New York racing circuit and developed top Grade I winners such as Lite The Fuse and the horse known as the "King of Aqueduct," King's Swan. He trained future U.S. Racing Hall of Fame inductee Flawlessly through her two-year-old season before the filly was sent by her owner to race in California.

In 1975, Richard Dutrow led all trainers in the United States with 352 wins.