| 1 Jan, 2023 (Sun) | New Year's Day | National holiday |
| 6 Jan, 2023 (Fri) | Epiphany | Observance |
| 14 Feb, 2023 (Tue) | Valentine's Day | Observance |
| 21 Mar, 2023 (Tue) | March Equinox | Season |
| 26 Mar, 2023 (Sun) | Daylight Saving Time starts | Clock change/Daylight Saving Time |
| 7 Apr, 2023 (Fri) | Good Friday | Bank holiday |
| 9 Apr, 2023 (Sun) | Easter Sunday | National holiday |
| 10 Apr, 2023 (Mon) | Easter Monday | National holiday |
| 1 May, 2023 (Mon) | Labor Day / May Day | National holiday |
| 8 May, 2023 (Mon) | Iris Day | Regional government holiday |
| 14 May, 2023 (Sun) | Mothers' Day | Observance |
| 18 May, 2023 (Thu) | Ascension Day | National holiday |
| 19 May, 2023 (Fri) | Day after Ascension Day | Bank holiday |
| 28 May, 2023 (Sun) | Whit Sunday | National holiday |
| 29 May, 2023 (Mon) | Whit Monday | National holiday |
| 11 Jun, 2023 (Sun) | Fathers' Day | Observance |
| 21 Jun, 2023 (Wed) | June Solstice | Season |
| 11 Jul, 2023 (Tue) | Day of the Flemish Community | Regional government holiday |
| 21 Jul, 2023 (Fri) | Belgian National Day | National holiday |
| 15 Aug, 2023 (Tue) | Assumption of Mary | National holiday |
| 17 Sep, 2023 (Sun) | Day of the Walloon Region | Regional government holiday |
| 23 Sep, 2023 (Sat) | September Equinox | Season |
| 27 Sep, 2023 (Wed) | Day of the French Community | Regional government holiday |
| 29 Oct, 2023 (Sun) | Daylight Saving Time ends | Clock change/Daylight Saving Time |
| 31 Oct, 2023 (Tue) | Halloween | Observance |
| 1 Nov, 2023 (Wed) | All Saints' Day | National holiday |
| 11 Nov, 2023 (Sat) | Armistice Day | National holiday |
| 15 Nov, 2023 (Wed) | Day of the German-speaking Community | Regional government holiday |
| 6 Dec, 2023 (Wed) | St. Nicholas Day | Observance |
| 22 Dec, 2023 (Fri) | December Solstice | Season |
| 24 Dec, 2023 (Sun) | Christmas Eve | Observance |
| 25 Dec, 2023 (Mon) | Christmas Day | National holiday |
| 26 Dec, 2023 (Tue) | Boxing Day | Bank holiday |
| 31 Dec, 2023 (Sun) | New Year's Eve | Observance |
