| 1/1/1921, Sat | New Year's Day |
- Note
- A statutory public holiday (Awal Tahun Masihi).
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| 2/8/1921, Tue | Chinese New Year |
- Note
- A statutory public holiday (Tahun Baru Cina).
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| 2/23/1921, Wed | National Day of Brunei Darussalam |
- Note
- A statutory public holiday (Hari Kebangsaan).
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| 4/6/1921, Wed | Isra' and Mi'raj |
- Note
- A statutory public holiday commemorating the Prophet Muhammad's night journey and ascension.
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| 5/9/1921, Mon | First Day of Ramadan |
- Note
- A statutory public holiday (Awal Ramadan).
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| 5/25/1921, Wed | Nuzul Al-Quran |
- Note
- A statutory public holiday commemorating the revelation of the Qur'an.
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| 5/31/1921, Tue | Royal Brunei Armed Forces Day |
- Note
- A statutory public holiday.
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| 6/8/1921, Wed | Hari Raya Aidil Fitri (Day 1) |
- Note
- A statutory public holiday.
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| 6/9/1921, Thu | Hari Raya Aidil Fitri (Day 2) |
- Note
- A statutory public holiday.
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| 6/13/1921, Mon | Hari Raya Aidil Fitri (Day 3): Actual Observance Day |
- Note
- A statutory public holiday.
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| 7/18/1921, 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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| 8/15/1921, Mon | Hari Raya Aidil Adha |
- Note
- A statutory public holiday.
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| 9/5/1921, Mon | Islamic New Year: Actual Observance Day |
- Note
- A statutory public holiday.
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| 11/14/1921, Mon | Prophet Muhammad's Birthday: Actual Observance Day |
- Note
- A statutory public holiday (Maulud Nabi Muhammad SAW).
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| 12/26/1921, Mon | Christmas Day: Actual Observance Day |
- Note
- A statutory public holiday.
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