| Birth Date: | 16 August 1898 |
| Birth Place: | Stockholm, Sweden |
| Death Date: | 3 June 1944 (aged 45) |
| Death Place: | Strömsholm, Sweden |
| Sport: | Horse riding |
| Club: | K2 IF, Helsingborg |
| Show-Medals: | yes |
Gregor Nils Henric Adlercreutz (16 August 1898 – 3 June 1944) was a Swedish equestrian who competed in the 1936 Summer Olympics. He and his horse Teresina placed fourth in the individual dressage competition and won a bronze medal with the Swedish dressage team. Adlercreutz was captain in the Scanian cavalry regiment and studied at a cavalry school in Hanover in 1937–38. His father Nils was also an Olympic equestrian and headed the Scanian regiment in 1921–27.
Adlercreutz died on 3 June 1944 in Strömsholm and was buried at Norra begravningsplatsen in Solna.[1]