| Beltane | Cultural | Festivities, Pagan, Summer |
| Calan Mai | Special Interest | Activities, Cultural |
| Couple Appreciation Day | Relationship | Appreciation, Love |
| CSS Reboot Day | Special Interest | Appreciation, Technology |
| Early May Bank Holiday | Federal | Awareness, Careers, Work |
| Executive Coaching Day | Special Interest | Appreciation, Careers, Work |
| Frequent Flyer Day | Special Interest | Fun, Lifestyle |
| Global Love Day | Special Interest | Appreciation, Love |
| Great Lakes Awareness Day | Special Interest | Awareness, Conservation, Environment |
| International Doodle Dog Day | Animal | Dog, International, Pet |
| International Sunflower Guerilla Gardening Day | Special Interest | Activities, Appreciation |
| Keep Kids Alive Drive 25 Day | Cause | Awareness, Children, Safety |
| Labour and Agriculture Day | Special Interest | Appreciation, Historical, Work |
| Learn to Ride a Bike Day | Special Interest | Activities, Hobby |
| Lei Day | Cultural | Festivities |
| Marshall Islands Constitution Day | Federal | Civic, Historical |
| May Day | Federal | Christian, Civic, Historical |
| Melanoma Monday | Health | Awareness, Diseases |
| National Black Barber Shop Appreciation Day | Appreciation | Careers, Work |
| National Blessing Day | Fun | Appreciation |
| National Chocolate Parfait Day | Food & Beverage | Chocolate, Dessert, Sweet Food |
| National Infertility Survival Day | Health | Health, Parents |
| National Loyalty Day | Federal | American, Civic, Cultural |
| National Mantra Day | Special Interest | Activities, Buddhist, Hindu |
| National Mother Goose Day | Special Interest | Appreciation, Books, Children |
| National Open Farm Day | Special Interest | Educational, Irish |
| National Purebred Dog Day | Animal | Dog, Pet |
| National Rotate Your Beer Day | Food & Beverage | Beer, Drinking, Liquor |
| New Home Owners Day | Special Interest | Appreciation, Family |
| Philippines Labor Day | Federal | Awareness, Civic |
| Phone in Sick Day | Fun | Fun |
| Save The Rhino Day | Cause | Conservation, Wildlife |
| School Principals' Day | Appreciation | Career, Educational |
| Silver Star Service Banner Day | Federal | Appreciation, Civic, Military |
| Therapeutic Massage Awareness Day | Health | Awareness, Careers, Health |
| Worthy Wage Day | Special Interest | Appreciation, Awareness, Work |
| Deaf Awareness Week | Cause | Awareness, Educational |
| Dog Anxiety Awareness Week | Animal | Dog, Pet Health |
| Hurricane Preparedness Week | Special Interest | Awareness, Environmental, Safety |
| Lawyer Well-Being Week | Cause | Careers, Mental Health, Work |
| National Auctioneers Week | Special Interest | Activities, Careers |
| National Physical Education and Sport Week | Special Interest | Education, Health, Sports |
| Screen Free Week | Special Interest | Awareness, Technology |
| Sun Awareness Week | Health | Awareness, Lifestyle, Safety |
| ALS Awareness Month | Health | Awareness, Diseases |
| American Cheese Month | Food & Beverage | American, Cooking, Food |
| American Wetlands Month | Cause | American, Awareness, Environment |
| Arthritis Awareness Month | Health | Diseases, Elderly |
| Asian American and Pacific Islander Heritage Month | Cause | Historical |
| Awareness of Medical Orphans Month | Health | Awareness, Diseases |
| Be Kind to Animals Month | Animal | Pet, Wildlife |
| Bealtaine Festival | Arts & Entertainment | Festivities, Irish |
| Better Sleep Month | Health | Awareness, Lifestyle, Mental Health |
| Better Speech and Hearing Month | Health | Awareness, Lifestyle |
| Bladder Cancer Awareness Month | Health | Awareness, Diseases, Educational |
| Borderline Personality Disorder Awareness Month | Health | Awareness, Mental Health |
| Brain Cancer Awareness Month | Health | Awareness, Diseases |
| Building Safety Month | Health | Awareness, Safety |
| Celiac Disease Awareness Month | Health | Diseases, Lifestyle |
| Chip Your Pet Month | Animal | Pet |
| Clean Air Month | Health | Awareness, Environment, Health |
| Correct Posture Month | Health | Awareness, Lifestyle |
| Creative Beginnings Month | Special Interest | Fun, Hobby |
| Date Your Mate Month | Relationship | Love |
| Deck Safety Month | Special Interest | Awareness, Educational, Safety |
| EDS Awareness Month | Health | Awareness, Educational |
| Electromagnetic Radiation Awareness Month | Special Interest | Awareness, Health, Technology |
| Family Wellness Month | Health | Activities, Educational, Family |
| Fibromyalgia Education and Awareness Month | Health | Awareness, Diseases, Educational |
| Food Allergy Action Month | Health | Cooking, Food |
| Fungal Infection Awareness Month | Health | Awareness, Diseases |
| Gardening for Wildlife Month | Animal | Conservation, Environment, Wildlife |
| Get Caught Reading Month | Special Interest | Books, Hobby |
| Gifts From The Garden Month | Special Interest | Hobby, Lifestyle |
| Global Employee Health and Fitness Month | Health | Work |
| Global Youth Traffic Safety Month | Special Interest | Awareness, Educational, Safety |
| Haitian Heritage Month | Special Interest | Appreciation, Cultural, Historical |
| Heal the Children Month | Cause | Awareness, Children, Family |
| Healthy Vision Month | Health | Awareness |
| Hepatitis Awareness Month | Health | Awareness |
| Homeschool Awareness Month | Special Interest | Awareness, Children, Education |
| Huntington's Disease Awareness Month | Health | Awareness, Safety |
| Indian Heritage Month | Cultural | Appreciation, Awareness, Cultural Holidays |
| International Business Image Improvement Month | Special Interest | Career, Financial |
| International Civility Awareness Month | Relationship | Awareness, Educational, Lifestyle |
| International Drum Month | Special Interest | Activities, Hobby, Music |
| International Internal Audit Awareness Month | Special Interest | Appreciation, Careers, Educational |
| International Respect for Chickens Month | Animal | Awareness |
| International Victorious Woman Month | Cultural | Appreciation, Lifestyle, Women |
| Jewish American Heritage Month | Religious | American, Appreciation, Jewish |
| Labor History Month | Special Interest | Appreciation, Historical, Work |
| Latino Books Month | Special Interest | Books, Hobby |
| Leaders of Tomorrow Month | Special Interest | American, Educational |
| Lettuce Month | Food & Beverage | Food, Vegetable |
| Local and Community History Month | Cultural | Awareness, Historical |
| Lung Health Awareness Month | Health | Awareness, Health |
| Lupus Awareness Month | Health | Awareness |
| Make May Purple /Action On Stroke Month | Health | Awareness, Safety |
| Maternal Mental Health Month | Health | Awareness, Mental Health, Women |
| May Measurement Month | Health | Awareness, Diseases, Educational |
| MCS Awareness Month | Health | Awareness, Diseases |
| Melanoma / Skin Cancer Detection & Prevention Month | Health | Diseases, Lifestyle |
| Mental Health Awareness Month | Health | Awareness, Lifestyle, Mental Health |
| Military Appreciation Month | Federal | Military |
| Motorcycle Safety Awareness Month | Special Interest | Awareness, Safety |
| National Allergy and Asthma Awareness Month | Health | Awareness, Diseases |
| National Anxiety Month | Health | Awareness, Lifestyle, Mental Health |
| National Asparagus Month | Food & Beverage | Appreciation, Food, Healthy Food |
| National Asthma and Allergy Awareness Month | Health | Awareness |
| National Barbecue Month | Food & Beverage | Cooking |
| National Bicycle Safety Month | Special Interest | Activities, Lifestyle, Safety |
| National Blood Pressure Month | Health | Diseases, Lifestyle |
| National Chocolate Custard Month | Food & Beverage | Chocolate, Dessert, Sweet Food |
| National Chronic Fatigue Syndrome Awareness Month | Health | Awareness, Diseases, Educational |
| National Comfort Month | Special Interest | Activities, Lifestyle, Technology |
| National Community Action Month | Cultural | American, Awareness |
| National Cystic Fibrosis Awareness Month | Health | Awareness, Educational |
| National Digestive Diseases Awareness Month | Health | American, Awareness |
| National Duckling Month | Animal | Food |
| National Egg Month | Food & Beverage | Breakfast, Food |
| National Foster Care Month | Appreciation | Awareness, Children, Parents |
| National Hamburger Month | Food & Beverage | American food, Food |
| National Heritage Month | Cultural | Cultural Holidays, Historical |
| National Inventors Month | Special Interest | Activities, Technology |
| National Lyme Disease Awareness Month | Health | Diseases |
| National Meditation Month | Special Interest | Activities, Health |
| National Mediterranean Diet Month | Health | Healthy Food, Lifestyle |
| National Moving Month | Special Interest | Activities, Lifestyle |
| National Osteoporosis Awareness and Prevention Month | Health | Awareness, Diseases, Educational |
| National Pet Month | Animal | Cat, Dog, Pet |
| National Photo Month | Special Interest | Activities, Appreciation, Fun |
| National Physical Fitness and Sports Month | Special Interest | Educational, Health, Sports |
| National Physiotherapy Month | | Appreciation, Careers, Educational |
| National Preservation Month | Cultural | Educational, Historical |
| National Prom Graduation Safety Month | Cultural | American |
| National Recommitment Month | Special Interest | Lifestyle |
| National Salad Month | Food & Beverage | Food, Healthy Food, Lifestyle |
| National Salsa Month | Food & Beverage | Food |
| National San Architect Month | Special Interest | American, Awareness, Technology |
| National Service Dog Eye Examination Month | Animal | Dog, Health |
| National Share a Story Month | Special Interest | Books, Children |
| National Show Your Smile Month | Fun | Appreciation, Awareness |
| National Sight-Saving Month | Health | Awareness, Educational |
| National Strawberry Month | Food & Beverage | Fruit, Healthy Food |
| National Stroke Awareness Month | Health | Awareness |
| National Teen Pregnancy Prevention Month | Health | American, Awareness |
| National Teen Self-Esteem Month | Cause | Love, Mental Health |
| National Toxic Encephalopathy and Chemical Injury Awareness Month | Health | Awareness, Educational |
| National Tuberous Sclerosis Awareness Month | Health | Awareness, Education |
| National Vinegar Month | Food & Beverage | Cooking, Food |
| National Walking Month | Health | Activities, Awareness, Lifestyle |
| National Youth Traffic Safety Month | Special Interest | Awareness, Children, Safety |
| Necrotizing Fasciitis Awareness Month | Health | Awareness, Diseases |
| Neurofibromatosis Month | Health | American, Diseases, Health |
| Older Americans Month | Appreciation | American, Elderly |
| Personal History Awareness Month | Special Interest | Awareness, Family |
| Pet Sitter Safety Month | Animal | Awareness, Pet, Safety |
| REACT Month | Special Interest | Appreciation, Safety, Work |
| Responsible Animal Guardian Month | Animal | Awareness, Pet, Pet Health |
| Revise Your Work Schedule Month | Special Interest | Careers, Work |
| Small Business Month | Special Interest | Appreciation, Careers, Work |
| Speech and Hearing Awareness Month | Cause | Awareness, Educational, International |
| Steelmark Month | Special Interest | American, Awareness, Technology |
| Strike Out Strokes Month | Health | Awareness |
| Syringomyelia Awareness Month | Health | Awareness, Diseases |
| Teen CEO Month | Special Interest | Careers, Children |
| Tennis Month | Special Interest | Health, Sports |
| Tuberous Sclerosis Awareness Month | Health | Awareness, Diseases |
| Ultraviolet Awareness Month | Special Interest | Awareness, Health |
| Women's Health Care Month | Health | Awareness, Diseases, Women |
| Zombie Awareness Month | Arts & Entertainment | Awareness, Fun, Pop Culture |
