St David's Day is celebrated every year on 1 March.
It is the day when the people of Wales, and others around the world, celebrate their patron saint, St David.
On the day, many people choose to wear Welsh national symbols, like a daffodil or leek.
Children enjoy traditional Welsh dances, sing Welsh folk songs and recite Welsh poems, and take part in school concerts or eisteddfodau.
Newsround wanted to know what you are doing to celebrate St David's Day.
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In school today, to celebrate Dydd Gwyl Dewi (St David's Day), we have dressed up in Welsh costumes. We have watched Tim Peake's message to Wales from the Space Station. This afternoon, we are having a School Eisteddfod. This will include singing, jokes, poetry, dancing and acting. At playtime, the teachers bring round Welsh Cakes and Bara Brith. For lunch we are having Cawl!
Pupils of Ysgol Gynradd Gymraeg y Login Fach, Swansea, Wales