Welcome to the EMBL-EBI Ontology Lookup Service

Examples: diabetes, GO:0098743 Looking for a particular ontology?

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, we also provide ontology tools and services such as OxO, Zooma, and OntoString.

Report an Issue

For feedback, enquiries or suggestion about OLS or to request a new ontology please use our GitHub issue tracker. For announcements relating to OLS, such as new releases and new features sign up to the OLS announce mailing list

Data Content

Updated 17 Nov 2022 19:33
  • 280 ontologies
  • 7,344,599 terms
  • 40,299 properties
  • 505,076 individuals