Eponyms beginning with O
- Oliver-Cardarelli symptom
- Oliver-Cardarelli-Olshausen sign
- Oliver’s sign
- Ollier's disease
- Ollier's layer
- Ollier-Klippel syndrome
- Ollier-Klippel-Trenaunay symptom complex
- Ollier-Klippel-Trenaunay-Weber syndrome
- Ollier-Thiersch graft
- Ollier-Thiersch transplant
- Olmos corneoscleral suture
- Olshausen's manipulation
- Olshausen's method
- Olshausen's operation
- Olshausen's suspension
- Olson's point
- Olson's test
- Onat's syndrome
- Opération de Mori (French)
- Opitz' BBB syndrome
- Opitz' N syndrome
- Opitz' trigonocephaly syndrome
- Opitz-Christian Syndrome
- Opitz-Frias syndrome
- Opitz-Johnson-McCreadie-Smith syndrome