Month of April
- Arab Heritage Month (Canada)
- Sikh Heritage Month
- Genocide Remembrance, Condemnation and Prevention Month
- World Autism Acceptance Month
- Arab Heritage Month (Canada)
- Autism Acceptance Month (International)
- Genocide Remembrance, Condemnation and Prevention Month (Canada)
- Limb Loss and Limb Difference Awareness Month (International)
- Parkinson Awareness Month (Canada)
- PMDD Awareness Month
- Sikh Heritage Month (Canada)
April 1
- Lent (Western)
- Great Lent, or the Great Fast (Orthodox / Eastern)
- Holy Week (Western)
- Passover / Pesach
April 2
- Lent (Western)
- Great Lent, or the Great Fast (Orthodox / Eastern)
- Holy Week (Western)
- Passover / Pesach
- Theravada New Year
- World Autism Awareness Day
- Sizdah Be-dar
- Holy Thursday / Maundy Thursday (Western)
April 3
April 4
April 6
April 5
April 6
April 7
- Great Lent, or the Great Fast (Orthodox / Eastern)
- Passover / Pesach
- Great and Holy Week (Orthodox / Eastern)
- National Caregiver Day
- International Day of Reflection on the 1994 Genocide against the Tutsi in Rwanda
- World Health Day
April 8
- Buddha’s Birthday
- Great Lent, or the Great Fast (Orthodox / Eastern)
- Passover / Pesach
- Great and Holy Week (Orthodox / Eastern)
- Birthday of Buddha
- International Roma Day
- International Day of Pink
April 9
- Great Lent, or the Great Fast (Orthodox / Eastern)
- Passover / Pesach
- Great and Holy Week (Orthodox / Eastern)
- Day of Valour / Araw ng Kagitingan
- Holy Thursday (Orthodox / Eastern)
April 10
April 11
April 12
April 13
April 14
April 15
April 19-25
April 20-30
April 22
April 23
April 24
April 28
April 30