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1st Mon in Oct - World Habitat Day
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2nd Thu in Oct World Sight Day
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Day in 1st week in Oct - World Ballet Day
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First Friday in October - World Smile Day
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First Monday in October - World Habitat Day
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October 1 - International Coffee Day
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October 1 - International Day of Older Persons
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October 1 - World Vegetarian Day
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October 10 - Fiji Day (Fiji)
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October 10 - World Mental Health Day
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October 11 - International Day of the Girl Child
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October 11 - National Coming Out Day
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October 11 - World Obesity Day
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October 12 - Columbus Day
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October 12 - World Sight Day
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October 13 - International Day for Disaster Reduction
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October 13 - World Thrombosis Day
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October 14 - World Standards Day
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October 15 - Global Handwashing Day
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October 15 - Pregnancy and Infant Loss Remembrance Day
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October 15 - White Cane Safety Day
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October 16 - National Boss Day (Boss's Day)
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October 16 - World Anaesthesia Day
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October 16 - World Food Day
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October 17 - International Day for the Eradication of Poverty
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October 18 - World Vasectomy Day
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October 2 - Gandhi Jayanthi
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October 2 - International Day of Non-Violence
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October 2 - Produce Misting Day
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October 2 - World Cerebral Palsy Day
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October 20 - World Osteoporosis Day
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October 20 - World Statistics Day
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October 21 - International Day of the Nacho
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October 21 - Trafalgar Day (United Kingdom)
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October 21 (2015 only) - Back to the Future Day
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October 22 - International Stuttering Awareness Day
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October 22 (also June 28) - CAPS LOCK DAY
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October 23 - Brazilian Air Force Day
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October 23 - International Cyrus The Great Memorial Day
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October 23 - Mole Day
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October 24 - United Nations Day
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October 24 - World Development Information Day
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October 26 - Intersex Awareness Day
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October 27 - World Day for Audiovisual Heritage
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October 28 - International Animation Day
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October 29 - National Cat Day (USA)
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October 29 - World Stroke Day
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October 3 - German Unity Day
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October 3 - Stevie Ray Vaughan Day (Austin, Texas, US)
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October 30 - Mischief Night
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October 31 - Reformation Day
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October 4 - eDay
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October 4 - World Animal Day
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October 5 - International Day of No Prostitution
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October 5 - World Teachers' Day
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October 6 - German-American Day
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October 9 - World Post Day
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Second Saturday in October - International Migratory Bird Day