| Coronation: | 8 February 1921 |
| Reign: | 8 February 1921 – 22 October 1939 |
| Predecessor1: | Hamengkubuwono VII |
| Successor1: | Hamengkubuwono IX |
| Succession: | 8th Sultan of Yogyakarta |
| House: | Mataram |
| Birth Date: | 1880 3, df=y |
| Birth Place: | Yogyakarta, Dutch East Indies |
| Birth Name: | Gusti Raden Mas Sujadi |
| Death Place: | Yogyakarta, Dutch East Indies |
| Mother: | Gusti Kanjeng Ratu Hemas |
| Father: | Hamengkubuwono VII |
| Place Of Burial: | Saptarengga Mausoleum, Pajimatan Imogiri Tombs |
| Spouse: | Kanjeng Raden Ayu Adipati Anom Hamengkunegara |
| Issue: | Hamengkubuwana IX |
Hamengkubuwono VIII (3 March 1880 – 22 October 1939), also spelled as Hamengkubuwana VIII, was the 8th sultan of Yogyakarta, reigning from 1921 until he died in 1939. During his reign, he carried out the rehabilitation of the Kraton Ngayogyakarta Hadiningrat building, as well as several other structures. He was also one of the first to support Kyai Haji Ahmad Dahlan in the formation of the Muhammadiyah organization.[1]
Hamengkubuwono VIII, born as Gusti Raden Mas Sujadi, was born on 3 March 1880. His father was the Sultan of Yogyakarta, Hamengkubuwono VII, while his mother was the first queen consort styled as Gusti Kanjeng Ratu Hemas[2] or Her Highness Queen Hemas in English.
During the leadership of Hamengkubuwono VIII, Yogyakarta experienced rapid progress in the fields of education and health. In the field of architecture, the sultan overhauled the current physical form of the palace.[3]
In the field of culture, several dances were created during his leadership, including the Srimpi dance. It was also at this time that the standardization of classical Yogyakarta-style dance standards began.
In 1939, he recalled his son, Raden Mas Dorodjatun (later known as Hamengkubuwono IX), who was studying in the Netherlands. In Batavia, the Sultan handed over the kris of Kyai Ageng Joko Piturun to Gusti Raden Mas Dorojatun as a sign of royal succession, as well as a sign that it was Gusti Raden Mas Dorojatun who would later succeed as Sultan.
He died on 22 October 1939, at Panti Rapih Hospital, Yogyakarta. He is buried in Astana Saptarengga, Pajimatan Imogiri.