| 6 Jan, 2023 (Fri) | Duruthu Full Moon Poya Day | Public Holiday |
| 15 Jan, 2023 (Sun) | Tamil Thai Pongal Day | Public Holiday |
| 16 Jan, 2023 (Mon) | Special Bank Holiday | Public Holiday |
| 4 Feb, 2023 (Sat) | National Day | Public Holiday |
| 5 Feb, 2023 (Sun) | Navam Full Moon Poya Day | Public Holiday |
| 14 Feb, 2023 (Tue) | Valentine's Day | Observance |
| 18 Feb, 2023 (Sat) | Mahasivarathri Day | Public Holiday |
| 6 Mar, 2023 (Mon) | Madin Full Moon Poya Day | Public Holiday |
| 8 Mar, 2023 (Wed) | Holi | Hindu Holiday |
| 21 Mar, 2023 (Tue) | March Equinox | Season |
| 24 Mar, 2023 (Fri) | Ramadan Start | Observance |
| 5 Apr, 2023 (Wed) | Bak Full Moon Poya Day | Public Holiday |
| 7 Apr, 2023 (Fri) | Good Friday | Public Holiday |
| 9 Apr, 2023 (Sun) | Easter Sunday | Observance |
| 13 Apr, 2023 (Thu) | Sinhala and Tamil New Year's Eve | Public Holiday |
| 14 Apr, 2023 (Fri) | Sinhala and Tamil New Year's Day | Public Holiday |
| 22 Apr, 2023 (Sat) | Eid al-Fitr | Public Holiday |
| 1 May, 2023 (Mon) | May Day | Public Holiday |
| 5 May, 2023 (Fri) | Vesak Full Moon Poya Day | Public Holiday |
| 6 May, 2023 (Sat) | Day after Vesak Full Moon Poya Day | Public Holiday |
| 14 May, 2023 (Sun) | Mother's Day | Observance |
| 3 Jun, 2023 (Sat) | Poson Full Moon Poya Day | Public Holiday |
| 18 Jun, 2023 (Sun) | Father's Day | Observance |
| 22 Jun, 2023 (Thu) | June Solstice | Season |
| 29 Jun, 2023 (Thu) | Eid al-Adha | Public Holiday |
| 3 Jul, 2023 (Mon) | Adhi Esala Full Moon Poya Day | Public Holiday |
| 1 Aug, 2023 (Tue) | Esala Full Moon Poya Day | Public Holiday |
| 30 Aug, 2023 (Wed) | Raksha Bandhan | Hindu Holiday |
| 30 Aug, 2023 (Wed) | Nikini Full Moon Poya Day | Public Holiday |
| 19 Sep, 2023 (Tue) | Ganesh Chaturthi | Hindu Holiday |
| 23 Sep, 2023 (Sat) | September Equinox | Season |
| 28 Sep, 2023 (Thu) | Milad-Un-Nabi (Holy Prophet's Birthday) (Tentative Date) | Public Holiday |
| 29 Sep, 2023 (Fri) | Binara Full Moon Poya Day | Public Holiday |
| 24 Oct, 2023 (Tue) | Dussehra | Hindu Holiday |
| 28 Oct, 2023 (Sat) | Vap Full Moon Poya Day | Public Holiday |
| 12 Nov, 2023 (Sun) | Deepavali | Public Holiday |
| 26 Nov, 2023 (Sun) | Ill Full Moon Poya Day | Public Holiday |
| 22 Dec, 2023 (Fri) | December Solstice | Season |
| 24 Dec, 2023 (Sun) | Christmas Eve | Observance |
| 25 Dec, 2023 (Mon) | Christmas Day | Public Holiday |
| 26 Dec, 2023 (Tue) | Unduvap Full Moon Poya Day | Public Holiday |
