International holidays - Micro Volunteering Day
Celebrated on 15 AprilInternational holidays - Micro Volunteering Day
Other holidays on 15 April
- International holidays - International Day of Environmental Knowledge (Ecological Knowledge Day)
- International holidays - International Day of Culture (World Day of Culture)
- Russian Holidays - Day of Electronic Warfare Specialist of the Russian Armed Forces
- Russian holidays - Days of protection from environmental hazards
- International holidays - World Art Day
- Funny holidays - World Mobile Free Day
- Holidays of Kazakhstan - Valentine's Day in Kazakhstan
- Holidays of Georgia - Day of Love
- Fun Holidays - Travel Light Day
- Holidays of Bosnia and Herzegovina - Army Day (Armed Forces Day)
- According to the folk calendar - Titus Ice Breaker
- Holidays of Ukraine - Day of Criminal Investigation Workers
- Memorial Day of St. Titus the Wonderworker
- Feast of the Icon of the Mother of God “Key of Understanding”