National / World Down Syndrome Day is observed every year on March 21.

Quick Scoop: When is National Down Syndrome Day?

  • The day is marked annually on 21 March.
  • Internationally it is known as World Down Syndrome Day , and many countries treat this as their main “national” awareness day too.
  • The date 21/3 was chosen to reflect trisomy 21 (three copies of chromosome 21), which causes Down syndrome.

Why March 21 Matters

  • The United Nations officially recognized World Down Syndrome Day on March 21 starting in 2012.
  • Each year, there is a global theme (for example, recent themes have focused on support systems and loneliness) to highlight rights, inclusion, and real-life experiences of people with Down syndrome.
  • Events, campaigns, and social media actions run worldwide on or around that date to raise awareness, challenge stereotypes, and promote equal opportunities.

Simple Answer Recap

  • When is National / World Down Syndrome Day?
    • Every year on March 21.

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