Mithers Day is likely a typo or mishearing of "Mother's Day." Mother's Day is celebrated in many countries around the world, often on different dates. In the United States and many other countries, including Canada, Germany, Italy, and Australia, Mother's Day is celebrated on the second Sunday of May. In 2025, this falls on May 11. In the United Kingdom and Ireland, the equivalent is called Mothering Sunday and is celebrated on the fourth Sunday in Lent, which is March 30, 2025. Other countries celebrate on various dates, such as June in Luxembourg. If you meant a different holiday or event by "Mithers Day," please clarify. But if you meant Mother's Day, then it is most commonly recognized on the second Sunday in May, May 11, 2025 this year in the U.S. and many other countries.