Welcome To OHDSI

OHDSI is a global community uniquely positioned
to make a critical difference in healthcare.

How does Observational Health Data Sciences and Informatics — OHDSI, pronounced "Odyssey" — fulfill its mission of empowering a community to collaboratively generate the real-world evidence
that promotes better health decisions and better care?


956 Million
Patient Records



We are a global community that includes more than 3,800 researchers from more than 83 nations across six continents.

Through the OMOP CDM, we have access to 956 million de-identified patient records — nearly 12% of the world's population

We use systematic research methods and open-source tools to generate reliable, robust real-world evidence.

We believe in the core tenets of open science and collaboration.
We can make a difference by working together!

OHDSI developed and uses the OMOP Common Data Model, an open-source platform for observational research. This data model allows for the standardization of health data from various sources, allowing the analysis of large datasets from multiple sources in a consistent and reproducible manner. OHDSI has also produced a suite of open-source software packages that enables the community to translate that data into reliable evidence.

• more than 600 peer-review studies published in scientific literature
• cited by European Medicines Agency in decision to re-authorize Astra-Zeneca’s COVID-19 vaccine
• collaborating with the U.S. Food and Drug Administration to conduct safety and effectiveness surveillance of biologic products, including vaccines
• showed that most popular antihypertensive drug wasn't most effective

Hear From The OHDSI Community

How Can You Get Involved?

SOS Challenge Focuses On Teaching Process Of & Executing Four Network Studies In 9 Weeks

Collaborator Showcase:
Azza Shoaibi

Registration Opens For All 2023 Symposiums; Global Showcase Submission Deadline Is June 15

#JoinTheJourney with OHDSI