| Hamengkubuwana VI | |
| Sri Sultan Hamengkubuwana VI | |
| Succession: | 6th Sultan of Yogyakarta |
| Reign: | 5 July 1855 – 28 July 1877 |
| Coronation: | 5 July 1855 |
| Predecessor: | Sultan Hamengkubuwana V |
| Successor: | Sultan Hamengkubuwana VII |
| Reg-Type: | Pemahkotaan |
| Birth Name: | Gusti Raden Mas Mustojo |
| Birth Date: | 10 August 1821 |
| Birth Place: | Kraton Yogyakarta, Yogyakarta |
| Death Place: | Kraton Yogyakarta, Yogyakarta |
| Burial Place: | Astana Besiyaran, Imogiri, Yogyakarta |
| Spouses: | Gusti Kanjeng Ratu Kencana of Surakarta (m. 1848) Gusti Kanjeng Ratu Sultan |
| Full Name: | Ngarsa Dalem Sampeyan Dalem Ingkang Sinuwun Kanjeng Sultan Hamengkubuwana Senapati-ing-Ngalaga 'Abdurrahman Sayyidin Panatagama Khalifatullah ingkang Jumeneng Kaping Enem ing Ngayogyakarta Hadiningrat |
| House: | Mataram |
| Father: | Sultan Hamengkubuwana IV |
| Mother: | Gusti Kanjeng Ratu Kencono[1] |
| Religion: | Islam |
| Signature Type: | Tanda tangan |
Sri Sultan Hamengkubuwono VI (10 August 1821 – 20 July 1877), also spelled Hamengkubuwana VI, was the sixth Sultan of Yogyakarta of the Yogyakarta Sultanate, who reigned from 1855 until 1877. He succeeded his older brother, Hamengkubuwono V, who died in the midst of political instability within the Yogyakarta Palace.[2] [3]