Fundus (Latin for "bottom") is an anatomical term referring to the portion of an organ opposite from its opening. Examples include:
- Fundus (stomach)
- Fundus of gallbladder
- Fundus (uterus)
- Fundus (eye)
- Fundus camera for photographing the interior of the eye.
- Fundus of the urinary bladder
- Fundus (seabed)
- Fundus (brain)
- Fundus (diencephalon)