South Korea's State Foundation Day (Gaecheonjeol)
Celebrated on 3 OctoberSouth Korea's State Foundation Day (Gaecheonjeol)
Other holidays on 3 October
- OMON Day in Russia (Day of Mobile Special Forces of the Ministry of Internal Affairs of the Russian Federation)
- World No Alcohol Day
- German Unity Day (Tag der Deutschen Einheit)
- International Frugal Fun Day
- Chestnut Search Day
- Mean Girls Day
- World Mushroom Picking Day
- According to the folk calendar - Astafy Windmill
- Look at the Leaves Day
- National Boyfriend Day in the USA
- National Techies Day in the USA
- National Caramel Custard Day
- Day of Remembrance for Victims of Immigration in Italy
- Memorial Day of the Great Martyr Eustathius Placidus, his wife Theopistia and children Agapius and Theopist
- Memorial Day of the Righteous Prince Mikhail of Chernigov and his boyar Theodore, miracle workers
- Cathedral of Bryansk Saints
- Memorial Day of the Righteous Prince Oleg Bryansky