WMDD is celebrated all over the world every 3rd Saturday of September, in 2023 it falls on September 16th. The event will be celebrated in more than 50 countries on all continents reaching hundreds of thousands of people through social as well as conventional media coverage.


World Marrow Donor Day (WMDD) is an initiative of the World Marrow Donor Association, the largest organisation dedicated to donor care and providing information for the facilitation of a search process. Our members are organising events all over the world to thank all blood stem cell donors worldwide. It is also a day to raise awareness among the general public and decision-makers about the importance of registering as a stem cell donor and the impact of blood stem cell transplantation on a patients’ life.


…that all patients deserve a chance to receive a stem cell transplant. Over 8% of the global searches result in zero matches in our global database of almost 40 million donors. Our target is to reduce this number. You can help by sharing your experience as a stem cell donor or recipient or by signing up as a potential lifesaver.


World Marrow Donor Day was born in September 2014. Click on the button below to see our memories of earlier editions.

Memories of previous WMDD’s


WMDD targets primarily the general public, but also seeks to raise awareness among policymakers, public authorities, industry representatives, researchers, health professionals and anyone who has a genuine interest in blood stem cell donation and blood stem cell transplantation.

This website includes information about WMDD and international donor/recipient stories.

All forms of participation for WMDD, big or small, are encouraged. Be creative and let your heart speak. Take pictures with your team or donors and post them on social media or websites. WMDD would not be possible without the continuous efforts of organisations around the world, building awareness locally in order to achieve a potential donor for each patient.

WMDD 2022

On 17 September 2022, WMDD will be held for the 8th time. Watch, like and share all the festive social media activity and see how you can participate in your country by following the #WMDD2022.

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9/11 NYPD officer and the British stem cell donor who saved his life

A New York police officer who was diagnosed with leukaemia which doctors believe was brought on by his efforts on September 11th was saved by a transatlantic stem cell donor who joined the donor register thirty years ago. Greg Holgerson, 42, was told his leukaemia could be linked to his involvement in the recovery efforts […]

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