| 1 Jan, 2023 (Sun) | Fathers' Day | Observance, Orthodox |
| 1 Jan, 2023 (Sun) | Western New Year's Day | National holiday |
| 2 Jan, 2023 (Mon) | Second Day of Western New Year's Day | National holiday |
| 3 Jan, 2023 (Tue) | Day off for Western New Year's Day | National holiday |
| 6 Jan, 2023 (Fri) | First Day of Baptism | Orthodox, Optional holiday |
| 7 Jan, 2023 (Sat) | Christmas Day | National holiday, Orthodox |
| 14 Jan, 2023 (Sat) | New Year | Observance, Orthodox |
| 27 Jan, 2023 (Fri) | Spirituality Day/St Sava's Day | Observance |
| 15 Feb, 2023 (Wed) | Statehood Day of the Republic of Serbia | National holiday |
| 16 Feb, 2023 (Thu) | Statehood Day of the Republic of Serbia (Day 2) | National holiday |
| 21 Mar, 2023 (Tue) | March Equinox | Season |
| 23 Mar, 2023 (Thu) | Ramadan Start | Observance |
| 7 Apr, 2023 (Fri) | Western Good Friday | Christian, Optional holiday |
| 8 Apr, 2023 (Sat) | Western Easter Saturday | Christian, Optional holiday |
| 9 Apr, 2023 (Sun) | Western Easter Sunday | Christian, Optional holiday |
| 10 Apr, 2023 (Mon) | Western Easter Monday | Christian, Optional holiday |
| 14 Apr, 2023 (Fri) | Good Friday | National holiday, Orthodox |
| 15 Apr, 2023 (Sat) | Holy Saturday | National holiday, Orthodox |
| 16 Apr, 2023 (Sun) | Easter Day | National holiday, Orthodox |
| 17 Apr, 2023 (Mon) | Easter Monday | National holiday, Orthodox |
| 21 Apr, 2023 (Fri) | Eid al-Fitr | Muslim, Optional holiday |
| 22 Apr, 2023 (Sat) | Holocaust Remembrance Day | Observance |
| 1 May, 2023 (Mon) | Labor holiday | National holiday |
| 2 May, 2023 (Tue) | Labor Day Holiday | National holiday |
| 9 May, 2023 (Tue) | Victory Day | Observance |
| 21 Jun, 2023 (Wed) | June Solstice | Season |
| 28 Jun, 2023 (Wed) | St Vitus' Day | Observance |
| 29 Jun, 2023 (Thu) | First Day of Eid al-Adha (Tentative Date) | Muslim, Optional holiday |
| 23 Sep, 2023 (Sat) | September Equinox | Season |
| 25 Sep, 2023 (Mon) | Yom Kippur | Hebrew, Optional holiday |
| 21 Oct, 2023 (Sat) | World War II Victims Remembrance Day | Observance |
| 11 Nov, 2023 (Sat) | Armistice Day | National holiday |
| 22 Dec, 2023 (Fri) | December Solstice | Season |
| 24 Dec, 2023 (Sun) | Mothers' Day | Observance, Orthodox |
| 25 Dec, 2023 (Mon) | First Day of Western Christmas | Christian, Optional holiday |
| 31 Dec, 2023 (Sun) | Fathers' Day | Observance, Orthodox |
| 31 Dec, 2023 (Sun) | Western New Year's Eve | Observance |
