03/20/2026
March 21st is World Down Syndrome Day! The Day was created to celebrate the lives of people with Down syndrome and to make sure they have the same freedoms and opportunities as everybody else.
21st March (21/3) matches the 3 copies of chromosome 21. This is unique to people with Down syndrome.
World Down Syndrome Day has been an official part of the United Nations calendar since 2012. You can read the full history of World Down Syndrome Day at the bottom of this page.
On 21st March each year, Down Syndrome International calls everyone to action with a theme to ensure the human rights of people with Down syndrome and works with members to organize worldwide activities and discussions.
Join us to promote full inclusion on World Down Syndrome Day!