- October 2 – Gandhi Jayanti (India)
- October 3 – Last third of Ramadan which includes Laylat al-Qadr (Islamic)
- October 3 – end of Sukkot, sunset (Judaism)
- October 5 – Proclamation of Republic (Portugal)
- October 8 – Thanksgiving (Canada)
- October 8 – Health and Sports Day (Japan)
- October 8 – Columbus Day (United States)
- October 16 – World Food Day
- October 13 – Eid ul-Fitr (Islam)
- October 20 – Kenyatta Day (Kenya)
- October 21 – Apple Day
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- October 24 – United Nations Day
- October 25 – Thanksgiving Day (Grenada; commemorates Invasion of Grenada, 1983)
- October 31 – Halloween
- Independence Day
- October 1 – (Nigeria and Cyprus)
- October 4 – (Lesotho)
- October 8 – (Croatia)
- October 24 – (Zambia)
- October 27 – (Azerbaijan, St. Vincent & the Grenadines, Turkmenistan, Czech Republic, and Slovakia)
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