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| Became Sultan: | October 4, 1967 |
| Predecessor: | Sir Omar Ali Saifuddin Sa'adul Khairi Waddien |
| Date of Birth: | July 15, 1946 |
| Place of Birth: | Bandar Seri Begawan, Brunei |
Sir Hassanal Bolkiah Mu'izzadin Waddaulah (born July 15, 1946) is the Sultan of Brunei, the eldest son of Omar Ali Saifuddin III, the previous sultan.
In addition to being Sultan, he is also the Prime Minister, Defense Minister, and Finance Minister of Brunei.
He became Crown Prince in 1961 and became Sultan on October 5, 1967, after his father abdicated, voluntarily. He has a vast private fortune, and is opposed to moves to democratise Brunei.
His heir is his son with Queen Saleha, Crown Prince Al-Muhtadee Billah Bolkiah.