In biological classification, a subfamily (Latin: subfamilia, plural subfamiliae) is an auxiliary (intermediate) taxonomic rank, next below family but more inclusive than genus. Standard nomenclature rules end subfamily botanical names with "-oideae", and zoological names with "-inae".
- International Code of Nomenclature for algae, fungi, and plants
- International Code of Zoological Nomenclature
- Rank (botany)
- Rank (zoology)