April 1
• April fool's day
• Easter Sunday
April 2
• World Autism Awareness Day
• Easter Monday
• Pascua Florida Day
April 4
• International Day for Mine Awareness and Assistance in Mine Action
April 5
• National Maritime Day
April 7
• World Health Day
• Last Day of Passover
• Orthodox Holy Saturday
April 8
• World Romani Day
• Orthodox Easter
April 12
• World Aviation & Cosmonauts Day
April 13
• Jallianwallah Bagh Massacre Day
• Thomas Jefferson's Birthday
April 14
• B.R.Ambedkar Remembrance Day
April 15
• World day of Silence
• Day of Dialogue
• Father Damien Day
April 17
• World Haemophilia Day
• Tax Day
April 18
• World Heritage Day
April 21
• World Creativity and Innovation Day
• National Secrataries day
• National Civil Services Day
April 22
• World Earth Day
• Oklahoma Day
April 23
• World Book and Copyright Day
• World English Language Day
• Confederate Memorial Day
April 24
• World Lab Animals Day
April 25
• World Malaria Day
• Italy Liberation Day
• Administrative Professionals Day
April 26
• World Intellectual Property Day
• Confederate Memorial Day
• Take our Daughters and Sons to Work Day
April 28
• International Worker’s Memorial Day
• World day for Safety and Health at Work
April 29
• World Dance Day
April 30
• International Jazz Day