Eustachian, meaning "discovered by, described by or attributed to Eustachi" (Latin name Eustachius) may refer to:
Anatomy
edit- Eustachian tube, an anatomical passage that links the ears to the sinuses
- Eustachian valve, a valve of the heart
Medicine
edit- Eustachian catheter, a medical instrument which became obsolete after the invention of politzerization.