Welcome to the EMBL-EBI Ontology Lookup Service.

About OLS

The Ontology Lookup Service (OLS) is a repository for biomedical ontologies that aims to provide a single point of access to the latest ontology versions. You can browse the ontologies through the website as well as programmatically via the OLS API. OLS is developed and maintained by the Samples, Phenotypes and Ontologies Team (SPOT) at EMBL-EBI.

Related Tools

In addition to OLS the SPOT team also provides Zooma, a service to assist in mapping data to ontologies in OLS and Webulous, a tool for building ontologies from spreadsheets. Also, look out in the new year for our new Ontology mapping service that will assist you in mapping between different but related ontologies.

Contact Us

For feedback, enquiries or suggestion about OLS or to request a new ontology please contact ols-support @ ebi.ac.uk. For bugs or problems with the code or API please report on GitHub issue For announcements relating to OLS, such as new releases and new features sign up to the OLS announce mailing list