| October 1 | Thursday | Nigeria Independence Day, World Vegetarian Day, National Black Dog Day |
| October 2 | Friday | National Custodian Day, World Smile Day, National Name Your Car Day |
| October 3 | Saturday | National Boyfriend Day, German Unity Day, Mean Girls Day, National Kevin Day |
| October 4 | Sunday | National Vodka Day, World Animal Day, National Golf Lovers Day, National Taco Day |
| October 5 | Monday | World Teachers' Day, National Do Something Nice Day |
| October 6 | Tuesday | National Noodle Day, National Transfer Money to Your Daughter Day, German-American Day, National Depression Screening Day, National Mad Hatter Day, National Plus Size Appreciation Day, World Cerebral Palsy Day |
| October 7 | Wednesday | National Walk to School Day |
| October 8 | Thursday | National Fluffernutter Day, National Pierogi Day, World Sight Day |
| October 9 | Friday | World Post Day, Curious Event Day, National Fire Prevention Day, World Egg Day |
| October 10 | Saturday | National Handbag Day, National Cake Decorating Day, National Hug a Drummer Day, National Tic Tac Day, World Mental Health Day |
| October 11 | Sunday | International Day of the Girl Child, It's My Party Day, National Coming Out Day, National Kimberly Day, National Sausage Pizza Day |
| October 12 | Monday | National Farmers Day, Fiesta Nacional de España, Columbus Day, Indigenous Peoples' Day, National Freethought Day, National Gumbo Day, National Pulled Pork Day, National Savings Day, National Vermont Day, Native American Day, World Arthritis Day, World Rheumatic Day |
| October 13 | Tuesday | National No Bra Day, Metastatic Breast Cancer Awareness Day, National M&M Day, National Transfer Money to Your Son Day, National Treat Yourself Day, US Navy Birthday |
| October 14 | Wednesday | Be Bald and Be Free Day, National Dessert Day, National Fossil Day |
| October 15 | Thursday | Conflict Resolution Day, Global Handwashing Day, National Grouch Day, National Mushroom Day, National Pregnancy and Infant Loss Remembrance Day |
| October 16 | Friday | National Boss's Day, World Food Day, Dictionary Day, Global Cat Day, National Feral Cat Day, World Anaesthesia Day |
| October 17 | Saturday | International Forgive an Ex Day, Black Poetry Day, Bridge Day, National Edge Day, National Pasta Day, National Pay Back a Friend Day |
| October 18 | Sunday | Health Care Aide Day, National No Beard Day, World Menopause Day |
| October 19 | Monday | Evaluate Your Life Day |
| October 20 | Tuesday | National Day on Writing, National Pharmacy Technician Day, International Chefs Day, International Sloth Day, Miss American Rose Day |
| October 21 | Wednesday | National Reptile Awareness Day, International Day of the Nacho, National Apple Day, National Medical Assistants Day, National Pets for Veterans Day |
| October 22 | Thursday | International Stuttering Awareness Day, National Nut Day |
| October 23 | Friday | Hungary National Day (1956 Revolution), National Boston Cream Pie Day, National Croc Day, National Mole Day, National Paralegal Day, Slap Your Annoying Coworker Day |
| October 24 | Saturday | United Nations Day, National Bologna Day, National Food Day, Zambia Independence Day |
| October 25 | Sunday | International Artist Day, National I Care About You Day, National Mother-in-Law Day, World Pasta Day |
| October 26 | Monday | Austrian National Day, National Pumpkin Day, National Chicken Fried Steak Day, National Day of the Deployed |
| October 27 | Tuesday | National American Beer Day, National Black Cat Day, National Mentoring Day, Navy Day |
| October 28 | Wednesday | National Chocolate Day, Czech Independence Day, National Immigrants Day |
| October 29 | Thursday | National Cat Day, National Internet Day, World Psoriasis Day |
| October 30 | Friday | National Text Your Ex Day, National Candy Corn Day, National Frankenstein Friday, National Publicist Day |
| October 31 | Saturday | Halloween, National Caramel Apple Day, National Pit Bull Awareness Day, Reformation Day, World Savings Day |