Eponyms beginning with O
- Ortolani's click
- Ortolani's click test
- Ortolani's sign and test
- Osgood-Schlatter disease
- Osler's disease
- Osler's filaria
- Osler's manoeuvre
- Osler's nodules
- Osler's sign
- Osler's sign
- Osler's syndrome
- Osler's triad
- Osler-Libman-Sacks syndrome
- Osler-Rendu-Weber syndrome
- Osler-Vaquez disease
- Osler’s disease
- Osler’s syndrome
- Osteochondrose, Typ Müller-Weiss (German)
- Österreicher-Fong syndrome
- Ostmann's fatty bodies
- Ostmann's fatty pads
- Otani's tumour
- Otto's syndrome
- Otto-Chrobak disease
- Otto-Chrobak pelvis