World Down Syndrome Day
Inclusion, opportunity, and dignity for every person with Down syndrome.
About
World Down Syndrome Day is observed on March 21 (21/3) — the date representing the triplication (trisomy) of chromosome 21 that causes Down syndrome. The day promotes public awareness and advocacy for the rights, inclusion, and well-being of people with Down syndrome. A signature activity is Lots of Socks, encouraging people to wear colourful, mismatched socks to celebrate uniqueness.
History
World Down Syndrome Day was first observed in 2006, initiated by Down Syndrome International. The United Nations General Assembly officially recognised March 21 as World Down Syndrome Day in 2012, calling on member states to affirm the right of people with Down syndrome to participate fully in society.
Where It's Observed
How to Participate
- 01Wear colourful, mismatched socks to raise awareness (#LotsOfSocks)
- 02Share stories of people with Down syndrome living full, independent lives
- 03Support a Down syndrome advocacy organisation
- 04Learn about inclusive education policies in your region
Frequently asked questions
When is World Down Syndrome Day?+
World Down Syndrome Day is observed annually on March 21. The date is fixed each year — March 21 — and does not shift based on the lunar calendar or weekday.
What is World Down Syndrome Day?+
World Down Syndrome Day is observed on March 21 (21/3) — the date representing the triplication (trisomy) of chromosome 21 that causes Down syndrome. The day promotes public awareness and advocacy for the rights, inclusion, and well-being of people with Down syndrome. A signature activity is Lots of…
Is World Down Syndrome Day a public holiday?+
World Down Syndrome Day is an international observance or awareness day, not a public holiday in most countries. It does not typically result in days off work or school closures, though some countries and organisations hold official events.
How can I participate in World Down Syndrome Day?+
Wear colourful, mismatched socks to raise awareness (#LotsOfSocks) Share stories of people with Down syndrome living full, independent lives Support a Down syndrome advocacy organisation These are some of the most accessible ways to engage with the day's purpose.
Which countries observe World Down Syndrome Day?+
Global — United Nations initiative.
Mark the date
Download a free printable calendar for 2027 and never miss World Down Syndrome Day.