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Welcome to OHDSI!
The Observational Health Data Sciences and Informatics (or OHDSI, pronounced "Odyssey") program is a multi-stakeholder, interdisciplinary collaborative to bring out the value of health data through large-scale analytics. All our solutions are open-source.
OHDSI has established an international network of researchers and observational health databases with a central coordinating center housed at Columbia University.
Read more about us, about our goals, and how you can help support the OHDSI community.
2025 Global Symposium
More than 400 collaborators came together for the 2025 Global Symposium to explore how we can strengthen trust in science and expand global collaboration through network studies. The event celebrated shared progress, new partnerships, and the community’s ongoing commitment to generating trustworthy, reproducible evidence around the world. Talks, posters, slides and more from the symposium are available on the event homepage.
