Nils August Domingo Adlercreutz (8 July 1866 – 27 September 1955) was a Swedish Army officer and horse rider who competed in the 1912 Summer Olympics.

[2] Adlercreutz was commissioned as an officer in 1890 and was assigned as a underlöjtnant to the Life Guards of Horse (K 1) where he was promoted to lieutenant in 1896.

Adlercreutz served as regimental quartermaster from 1904 to 1906 and as a teacher at the Swedish Army Riding and Horse-Driving School in Strömsholm from 1906 to 1908.

[3] In parallel to his military career, he also served as secretary of Stockholm Field Riding Club and as a judge at Ulriksdal's Racecourse.

[4] He and his horse Atout finished fourth in the individual eventing competition and won a gold medal with the Swedish team.