| 1 Jan, 2023 (Sun) | New Year's Day | National holiday |
| 21 Jan, 2023 (Sat) | Princess Ingrid Alexandra's Day | Flag day |
| 6 Feb, 2023 (Mon) | Saami National Day | Flag day |
| 12 Feb, 2023 (Sun) | Mothers' Day | Observance |
| 14 Feb, 2023 (Tue) | Valentine's Day | Observance |
| 19 Feb, 2023 (Sun) | Carnival | Observance |
| 21 Feb, 2023 (Tue) | King Harald V's Day | Flag day |
| 21 Mar, 2023 (Tue) | March Equinox | Season |
| 26 Mar, 2023 (Sun) | Daylight Saving Time starts | Clock change/Daylight Saving Time |
| 2 Apr, 2023 (Sun) | Palm Sunday | Observance |
| 6 Apr, 2023 (Thu) | Maundy Thursday | National holiday |
| 7 Apr, 2023 (Fri) | Good Friday | National holiday |
| 8 Apr, 2023 (Sat) | Holy Saturday | Observance |
| 9 Apr, 2023 (Sun) | Easter Sunday | National holiday |
| 10 Apr, 2023 (Mon) | Easter Monday | National holiday |
| 1 May, 2023 (Mon) | Labor Day | National holiday, Flag day |
| 8 May, 2023 (Mon) | Day of Liberation | Observance, Flag day |
| 17 May, 2023 (Wed) | 17 May Constitution Day (1814) | National holiday, Flag day |
| 18 May, 2023 (Thu) | Ascension Day | National holiday |
| 27 May, 2023 (Sat) | Whit Saturday | Observance |
| 28 May, 2023 (Sun) | Whit Sunday | National holiday |
| 29 May, 2023 (Mon) | Whit Monday | National holiday |
| 7 Jun, 2023 (Wed) | Dissolution of Union With Sweden (1905) | Flag day |
| 21 Jun, 2023 (Wed) | June Solstice | Season |
| 23 Jun, 2023 (Fri) | Midsummer Eve | Observance |
| 24 Jun, 2023 (Sat) | St. John's Day | Observance |
| 4 Jul, 2023 (Tue) | Queen Sonja's Day | Flag day |
| 20 Jul, 2023 (Thu) | Crown Prince Haakon's Day | Flag day |
| 29 Jul, 2023 (Sat) | St. Olaf's Day | Flag day |
| 19 Aug, 2023 (Sat) | Crown Princess Mette-Marit's Day | Flag day |
| 23 Sep, 2023 (Sat) | September Equinox | Season |
| 24 Oct, 2023 (Tue) | United Nations Day | Observance |
| 29 Oct, 2023 (Sun) | Repentance Day | Observance |
| 29 Oct, 2023 (Sun) | Daylight Saving Time ends | Clock change/Daylight Saving Time |
| 31 Oct, 2023 (Tue) | Halloween | Observance |
| 5 Nov, 2023 (Sun) | All Saints' Day | Observance |
| 12 Nov, 2023 (Sun) | Fathers' Day | Observance |
| 3 Dec, 2023 (Sun) | First Advent Sunday | Observance |
| 10 Dec, 2023 (Sun) | Second Advent Sunday | Observance |
| 17 Dec, 2023 (Sun) | Third Advent Sunday | Observance |
| 22 Dec, 2023 (Fri) | December Solstice | Season |
| 24 Dec, 2023 (Sun) | Fourth Advent Sunday | Observance |
| 24 Dec, 2023 (Sun) | Christmas Eve | Bank Holiday / Observance |
| 25 Dec, 2023 (Mon) | Christmas Day | National holiday |
| 26 Dec, 2023 (Tue) | Boxing Day | National holiday |
| 31 Dec, 2023 (Sun) | New Year's Eve | Observance |
