| 1/1/1991, Tue | New Year's Day |
- Note
- A statutory public holiday (Awal Tahun Masihi).
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| 2/12/1991, Tue | Isra' and Mi'raj |
- Note
- A statutory public holiday commemorating the Prophet Muhammad's night journey and ascension.
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| 2/18/1991, Mon | Chinese New Year: Actual Observance Day |
- Note
- A statutory public holiday (Tahun Baru Cina).
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| 2/23/1991, Sat | National Day of Brunei Darussalam |
- Note
- A statutory public holiday (Hari Kebangsaan).
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| 3/18/1991, Mon | First Day of Ramadan: Actual Observance Day |
- Note
- A statutory public holiday (Awal Ramadan).
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| 4/2/1991, Tue | Nuzul Al-Quran |
- Note
- A statutory public holiday commemorating the revelation of the Qur'an.
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| 4/16/1991, Tue | Hari Raya Aidil Fitri (Day 1) |
- Note
- A statutory public holiday.
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| 4/17/1991, Wed | Hari Raya Aidil Fitri (Day 2) |
- Note
- A statutory public holiday.
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| 4/18/1991, Thu | Hari Raya Aidil Fitri (Day 3) |
- Note
- A statutory public holiday.
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| 6/3/1991, Mon | Royal Brunei Armed Forces Day: Actual Observance Day |
- Note
- A statutory public holiday.
|
| 6/24/1991, Mon | Hari Raya Aidil Adha: Actual Observance Day |
- Note
- A statutory public holiday.
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| 7/13/1991, Sat | Islamic New Year |
- Note
- A statutory public holiday.
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| 7/15/1991, Mon | H.M. The Sultan's Birthday |
- Note
- A statutory public holiday. H.M. Sultan Haji Hassanal Bolkiah's Birthday (born 15 July 1946).
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| 9/21/1991, Sat | Prophet Muhammad's Birthday |
- Note
- A statutory public holiday (Maulud Nabi Muhammad SAW).
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| 12/25/1991, Wed | Christmas Day |
- Note
- A statutory public holiday.
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