Cornu (pl. cornua) is a Latin word for horn. Cornu may also refer to:
- Cornu (horn), an ancient musical instrument
People:
- Dominique Cornu, a Belgian road and track cyclist, born 1985.
- Marie Alfred Cornu, a physicist for whom the Cornu spiral is named
- Paul Cornu, an engineer sometimes credited as the creator of the first helicopter
Places:
- Cornu, Prahova, a commune in Prahova County, Romania
- Cornu, a village in Bucerdea Grânoasă Commune, Alba County, Romania
- Cornu, a village in Orodel Commune, Dolj County, Romania
- Cornu de Jos (disambiguation), multiple places
- Cornu Luncii, a commune in Suceava County, Romania
- Cornu–, a prefix used to indicate a relation to Cornwall
In zoology:
- Cornu (subgenus), a subgenus of snails of the genus Helix
In anatomy:
- Cornu ammonis, a part of the hippocampus of the brain
- Cornu anterius, cornu inferius, and cornu posterius, parts of the lateral ventricle of the brain
- Cornu anterius, or anterior horn, of the spinal cord
- Cornu coccygeum, one of two upward projecting processes which articulate with the sacrum
- Cornua of the hyoid, the greater and lesser horns of the hyoid bones
- Sacral Cornua, two small processes projecting inferiorly on either side of the sacral hiatus leading into the sacral canal.
- Uterine cornu, or uterine horn, located near the entry of the Fallopian tube
In Medicine
- Cutaneous horn, an eruption of the skin, mostly in fair skinned persons which can be benign but is often a precursor of skin cancer.