| 1/1/1990, Mon | New Year's Day |
- Note
- A statutory public holiday (Awal Tahun Masihi).
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| 1/27/1990, Sat | Chinese New Year |
- Note
- A statutory public holiday (Tahun Baru Cina).
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| 2/26/1990, Mon | Isra' and Mi'raj: Actual Observance Day |
- Note
- A statutory public holiday commemorating the Prophet Muhammad's night journey and ascension.
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| 2/26/1990, Mon | National Day of Brunei Darussalam: Actual Observance Day |
- Note
- A statutory public holiday (Hari Kebangsaan).
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| 3/28/1990, Wed | First Day of Ramadan |
- Note
- A statutory public holiday (Awal Ramadan).
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| 4/16/1990, Mon | Nuzul Al-Quran: Actual Observance Day |
- Note
- A statutory public holiday commemorating the revelation of the Qur'an.
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| 4/28/1990, Sat | Hari Raya Aidil Fitri (Day 2) |
- Note
- A statutory public holiday.
|
| 4/30/1990, Mon | Hari Raya Aidil Fitri (Day 1): Actual Observance Day |
- Note
- A statutory public holiday.
|
| 4/30/1990, Mon | Hari Raya Aidil Fitri (Day 3): Actual Observance Day |
- Note
- A statutory public holiday.
|
| 5/31/1990, Thu | Royal Brunei Armed Forces Day |
- Note
- A statutory public holiday.
|
| 7/4/1990, Wed | Hari Raya Aidil Adha |
- Note
- A statutory public holiday.
|
| 7/16/1990, Mon | H.M. The Sultan's Birthday: Actual Observance Day |
- Note
- A statutory public holiday. H.M. Sultan Haji Hassanal Bolkiah's Birthday (born 15 July 1946).
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| 7/24/1990, Tue | Islamic New Year |
- Note
- A statutory public holiday.
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| 10/2/1990, Tue | Prophet Muhammad's Birthday |
- Note
- A statutory public holiday (Maulud Nabi Muhammad SAW).
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| 12/25/1990, Tue | Christmas Day |
- Note
- A statutory public holiday.
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