Henri Julius Reverony Saint Cyr (15 March 1902 – 27 July 1979) was a Swedish officer and equestrian.

[1] Saint Cyr was commissioned as an officer in 1924 and was assigned as a second lieutenant to Svea Artillery Regiment (A 1) the same year.

[1] He competed at five consecutive Olympics from 1936 to 1960 and won two gold medals in 1952 and two in 1956, all in individual and team dressage.

[2][3] Saint Cyr was the national champion in eventing in 1935, 1937, and 1939 and won a world title in the individual dressage in 1953.

[4][5] Saint Cyr was a board member of the Swedish Equestrian Federation (Svenska ridsportens centralförbund) from 1932 to 1948 and from 1950 to 1959.