October 4 Holidays, events and History 2021.
| Date | Day | Holiday Name | Holiday Type | Country |
| 4 Oct | Monday | Independence Day | Public Holiday | Lesotho |
| 4 Oct | Monday | Peace and Reconciliation Day | Public Holiday | Mozambique |
| 4 Oct | Monday | Territory Day | State Holiday | Australia |
| 4 Oct | Monday | May Day | State Holiday | Australia |
| 4 Oct | Monday | Day off for Tuvalu Day Holiday | Public Holiday | Tuvalu |
| 4 Oct | Monday | Peat Cutting Monday | Public Holiday | Falkland Islands |
| 4 Oct | Monday | Thanksgiving Day | Public Holiday | Saint Lucia |