| 1 Jan, 2023 (Sun) | New Year's Day | National holiday |
| 2 Jan, 2023 (Mon) | New Year holiday | National holiday |
| 8 Feb, 2023 (Wed) | Prešeren Day | National holiday |
| 21 Mar, 2023 (Tue) | March Equinox | Season |
| 25 Mar, 2023 (Sat) | Mothers' Day | Observance |
| 9 Apr, 2023 (Sun) | Easter Sunday | National holiday |
| 10 Apr, 2023 (Mon) | Easter Monday | National holiday |
| 27 Apr, 2023 (Thu) | Day of Uprising Against Occupation | National holiday |
| 1 May, 2023 (Mon) | Labor Day / May Day | National holiday |
| 2 May, 2023 (Tue) | Labour Day holiday | National holiday |
| 28 May, 2023 (Sun) | Whit Sunday | National holiday |
| 8 Jun, 2023 (Thu) | Primož Trubar Day | Observance |
| 18 Jun, 2023 (Sun) | Fathers' Day | Observance |
| 21 Jun, 2023 (Wed) | June Solstice | Season |
| 25 Jun, 2023 (Sun) | Statehood Day | National holiday |
| 15 Aug, 2023 (Tue) | Assumption of Mary | National holiday |
| 17 Aug, 2023 (Thu) | Slovenians in Prekmurje Incorporated into the Mother Nation Day | Observance |
| 15 Sep, 2023 (Fri) | Restoration of Primorska to the Motherland Day | Observance |
| 23 Sep, 2023 (Sat) | Slovenian Sports Day | Observance |
| 23 Sep, 2023 (Sat) | September Equinox | Season |
| 25 Oct, 2023 (Wed) | Sovereignty Day | Observance |
| 31 Oct, 2023 (Tue) | Reformation Day | National holiday |
| 1 Nov, 2023 (Wed) | Remembrance Day | National holiday |
| 23 Nov, 2023 (Thu) | Rudolf Maister Day | Observance |
| 22 Dec, 2023 (Fri) | December Solstice | Season |
| 25 Dec, 2023 (Mon) | Christmas Day | National holiday |
| 26 Dec, 2023 (Tue) | Independence and Unity Day | National holiday |
