April 7 - World Health Day: Created by the World Health Organization (WHO) in 1950, this day raises awareness about global health issues and promotes healthy living practices.
April 12 - International Day of Human Space Flight: This day celebrates the anniversary of the first human spaceflight by Yuri Gagarin in 1961. It is a global celebration of human space exploration and its impact on society. The United Nations General Assembly established the International Day of Human Space Flight in 2011.
April 22 - Earth Day: Created in 1970, this day is dedicated to promoting environmental awareness and protection. It is now recognized in over 190 countries.
April 25 - DNA Day: This day celebrates the discovery of the double helix structure of DNA by James Watson and Francis Crick in 1953.
April 25 - World Malaria Day: Created in 2007 by the World Health Organization, this day raises awareness about the prevention, control, and treatment of malaria, a serious and often fatal disease caused by a parasite transmitted by infected mosquitoes.
April 26 - World Intellectual Property Day: Created by the World Intellectual Property Organization (WIPO) in 2000, this day highlights the importance of intellectual property in promoting innovation and creativity.