Month:

• National Canine Fitness Month 

Week:

• National Wildlife Week (April 6 - 10)

Day:

• April 6: National Siamese Cat Day
• April 8:  Zoo Lovers Day
• April 10: National Hug Your Dog Day
• April 10: National Farm Animals Day
• April 11: National Pet Day
• April 16: Save the Elephant Day
• April 17: International Bat Appreciation Day
• April 21: National Bulldogs are Beautiful Day
• April 23:  National Lost Dogs Awareness Day
• April 25: World Penguin Day
• April 28: International Guide Dog Day
• April 30:  National Adopt a Shelter Pet Day

Month:

• Deaf History Month (March 13-April 15)
• Arab American Heritage Month

Day:

• April 1: April Fools' Day
• April 4: Easter
• April 22: Earth Day
• April 30:  National Arbor Day* (last Friday)

Month:

• National Garden Month
• National Pecan Month

Day:

• April 2: National Peanut Butter and Jelly Day
• April 3: National Chocolate Mousse Day
• April 4: International Carrot Cake Day
• April 5: National Deep Dish Pizza Day
• April 7: National Beer Day
• April 7: National Coffee Cake Day
• April 8: National Empanada Day
• April 12: National Grilled Cheese Sandwich Day
• April 13: National Peach Cobbler Day
• April 15: National Banana Day
• April 16: National Eggs Benedict Day
• April 18:  National Animal Crackers Day
• April 19: National Garlic Day
• April 22: National Jelly Bean Day
• April 23: Have A Picnic Day
• April 24: National Pigs in a Blanket Day
• April 25: Zucchini Bread Day
• April 26: National Pretzel Day
• April 27: Prime Rib Day
• April 29: International Shrimp Scampi Day
• April 30:  National Bubble Tea Day

Month:

• Distracted Driving Awareness Month
• Irritable Bowel Syndrome (IBS) Awareness Month
• National Alcohol Awareness Month
• National Autism Awareness Month
• National Child Abuse Awareness Month
• National Donate Life Awareness Month
• National Minority Health Month
• Sexual Assault Awareness Month

Week:

• National Public Health Week (April 6 - 12)
• National Infertility Awareness Week (April 19–25)
• World Immunization Week (April 24–30)
• National Infant Immunization Week (April 26 - May 3)

Day:

• April 2: World Autism Awareness Day
• April 7: World Health Day
• April 8:  National Alcohol Screening Day 
• April 10: National Youth HIV/AIDS Awareness Day
• April 24: World Meningitis Day
• April 25: World Malaria Day

Month:

• National Interns Month 

Week:

• National Work Zone Awareness Week (April 26 - 30)

Day:

• April 2: Walk to Work Day
• April 4: National School Librarian Day
• April 4: National Geologists Day
• April 6: National Student-Athlete Day
• April 14: National Library Workers Day
• April 16: Wear Pajamas to Work Day
• April 18:  The National Columnists Day
• April 20: Volunteer Recognition Day
• April 21:  Administrative Professionals Day
• April 22:  Take Your Child  to Work Day
• April 25: National Plumber's Day
• April 25: National Hairstylist Appreciation Day
• April 28: International Guide Dog Day

Month:

• National Month of Hope
• National Financial Literacy Month
• National Cannabis Awareness Month
• National Fair Housing Month
• National Garden Month
• National Kite Month
• National Poetry Month

Week:

• National Library Week (April 4 - 10)

Day:

• April 2: International Children's Book Day
• April 10: National Siblings Day
• April 13: National Scrabble Day
• April 13: Plant Appreciation Day
• April 15: National Tax Day
• April 15: National High Five Day
• April 17: Husband Appreciation Day
• April 21: National Kindergarten Day
• April 22: Teach Children to Save Day
• April 27: Babe Ruth Day
• April 27: Morse Code Day
• April 28: National Superhero Day
• April 29: International Dance Day
• April 29: Day of Remembrance for all Victims of Chemical Warfare
• April 30: International Jazz Day
• April 30:  National Honesty Day