Holidays in Poland - Grandmother's Day (Dzien Babci)
Celebrated on 21 JanuaryHolidays in Poland - Grandmother's Day (Dzien Babci)
Other holidays on 21 January
- World Snow Day (International Winter Sports Day)
- World Religion Day
- International holidays - International Hug Day
- Russian Holidays - Day of the Russian Engineering Troops
- International holidays - Alcohol Independence Day
- Russian Holidays - Postgraduate Day
- Holidays of the Slavs - Prosinets
- Fun Holidays - International Sweatpants Day
- Funny Holidays - One-Liners Day
- Funny Holidays - International Playdate Day
- Holidays of Belarus - Day of the Engineering Troops of Belarus
- According to the folk calendar - Emelin's day
- Putrada Ekadashi in India
- Memorial Day of St. George Khozevit
- Memorial Day of St. Emilian of Kizi
- Memorial Day of St. Gregory of Pechersk
- Memorial Day of Venerable Domnika of Constantinople