National Down Syndrome Society (NDSS)

Groups of advocates pose in front of the US Capitol Building

NDSS' mission is to create a world where individuals with Down syndrome thrive.

Turn Everyday Purchases into Impact

NDSS is partnering with Upside, a free cash back app that rewards you for everyday purchases at gas stations, grocery stores, and restaurants. Now, when you earn cash back through Upside, you can choose to donate those rewards to help individuals with Down syndrome thrive.

Learn more

Women wearing red and blue NDSS tanks run through the streets of Paris during a marathon, smiling as they pass Parisian buildings with red awnings. Logos for HOKA Semi de Paris, National Down Syndrome Society, and Schneider Electric Marathon de Paris appear on the left.

Join Team NDSS in Paris

Join Team NDSS in Paris! Run to help create a world where individuals with Down syndrome thrive. Apply to join the half or full marathon:

Hoka Semi De Paris Half Marathon – March 7, 2027
Apply for the Half Marathon
Schneider Electric De Paris Full Marathon – April 11, 2027
Apply for the Full Marathon