World Down Syndrome Day 2027
A UN-recognised day raising awareness of Down syndrome and celebrating the lives and rights of people with it.
Quick facts
- Date
- March 21
- Day of the week
- Sunday in 2027
- Type
- International, Awareness
- Observed in
- Global
- First observed
- 2006 (UN observance since 2012)
- Established by
- Down Syndrome International
- Also known as
- Odd-socks day
- Hashtag
- #WorldDownSyndromeDay
Overview
World Down Syndrome Day is held on March 21 — the 21st day of the 3rd month — chosen to represent the three copies of chromosome 21 that cause Down syndrome. People wear bright, mismatched socks to start conversations about inclusion.
History
Down Syndrome International and its members began observing the day in 2006. The UN General Assembly declared it an official UN day in December 2011, first observed in 2012.
How to celebrate
Wear odd socks
Rock your socks to spark a conversation.
Champion inclusion
Support inclusive schools, clubs and workplaces.
Wishes and messages
Greeting card
A 1080 × 1080 image, ready for WhatsApp, Facebook and Instagram.
Social media captions
Rock your socks! 🧦 #WorldDownSyndromeDay
World Down Syndrome Day dates
| Year | Date | Day of the week | Days from today |
|---|---|---|---|
| 2026 | March 21 | Saturday | Passed |
| 2027 | March 21 | Sunday | 138 |
| 2028 | March 21 | Tuesday | 504 |
| 2029 | March 21 | Wednesday | 869 |
| 2030 | March 21 | Thursday | 1,234 |
| 2031 | March 21 | Friday | 1,599 |
Frequently asked questions
Why is World Down Syndrome Day on March 21?
21/3 represents the three copies of chromosome 21.
Last updated November 2, 2026