# Mondo disease ontology

Source: https://onco.cc/terms/mondo/  
OnCo record `mondo` (Term). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)"; commercial use needs a licence.

## TL;DR

Mondo is a unified disease ontology that merges the disease vocabularies (OMIM, Orphanet, NCIt, ICD and others) into one hierarchy with cross-references, so a disease named in one system can be found in the others.

## Summary

An ontology in information science is a formal naming and definition of categories and their relations (Wikipedia); Mondo, from the Monarch Initiative, is a disease ontology built by harmonising existing disease resources into a single logically defined hierarchy with equivalence mappings to each source. It is used to annotate datasets and knowledge graphs where diseases from different vocabularies must be treated as one, including cancer types alongside rare diseases.

## Fields

- Kind: Term
- Last checked: 2026-09-24
- Also known as: Mondo; MONDO; Mondo disease ontology; Mondo ID; MONDO id
- Tags: cansim-terms

## Notes

- Listed in the CanSim terms map 1.0.0 (docs/onco/terms.json, generated 2026-09-24), CC BY 4.0, attribution: CanSim project, an open, public-data-first cancer foundation-model programme; CanSim page path /terms/mondo.

## Sources

- Mondo Disease Ontology (Monarch Initiative): https://mondo.monarchinitiative.org/
- Wikipedia: ontology (information science): https://en.wikipedia.org/wiki/Ontology_(information_science)

## Connected records

- terms: [Cancer AI vocabulary (CanSim terms map)](https://onco.cc/terms/cancer-ai-vocabulary/), [Human Phenotype Ontology (HPO)](https://onco.cc/terms/hpo/), [ICD-O-3 (International Classification of Diseases for Oncology)](https://onco.cc/terms/icd-o-3/), [NCI Thesaurus (NCIt)](https://onco.cc/terms/ncit/), [Uberon anatomy ontology and the Cell Ontology](https://onco.cc/terms/uberon/)

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JSON: https://onco.cc/api/v1/entities/mondo.json