| 1/1/1940, Mon | New Year's Day |
- Note
- A statutory public holiday (Awal Tahun Masihi).
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| 1/22/1940, Mon | Hari Raya Aidil Adha: Actual Observance Day |
- Note
- A statutory public holiday.
|
| 2/8/1940, Thu | Chinese New Year |
- Note
- A statutory public holiday (Tahun Baru Cina).
|
| 2/10/1940, Sat | Islamic New Year |
- Note
- A statutory public holiday.
|
| 2/26/1940, Mon | National Day of Brunei Darussalam: Actual Observance Day |
- Note
- A statutory public holiday (Hari Kebangsaan).
|
| 4/20/1940, Sat | Prophet Muhammad's Birthday |
- Note
- A statutory public holiday (Maulud Nabi Muhammad SAW).
|
| 6/3/1940, Mon | Royal Brunei Armed Forces Day: Actual Observance Day |
- Note
- A statutory public holiday.
|
| 7/15/1940, Mon | H.M. The Sultan's Birthday |
- Note
- A statutory public holiday. H.M. Sultan Haji Hassanal Bolkiah's Birthday (born 15 July 1946).
|
| 8/31/1940, Sat | Isra' and Mi'raj |
- Note
- A statutory public holiday commemorating the Prophet Muhammad's night journey and ascension.
|
| 10/3/1940, Thu | First Day of Ramadan |
- Note
- A statutory public holiday (Awal Ramadan).
|
| 10/19/1940, Sat | Nuzul Al-Quran |
- Note
- A statutory public holiday commemorating the revelation of the Qur'an.
|
| 11/2/1940, Sat | Hari Raya Aidil Fitri (Day 1) |
- Note
- A statutory public holiday.
|
| 11/4/1940, Mon | Hari Raya Aidil Fitri (Day 2): Actual Observance Day |
- Note
- A statutory public holiday.
|
| 11/4/1940, Mon | Hari Raya Aidil Fitri (Day 3) |
- Note
- A statutory public holiday.
|
| 12/25/1940, Wed | Christmas Day |
- Note
- A statutory public holiday.
|