Prof. Colm O'Brien
Ophthalmology
Dr. Conor O'Brien
Neurophysiology
Prof. John O'Byrne
Orthopaedics
Dr. Dermot O'Callaghan
Respiratory Medicine
Prof. Martin O'Connell
Radiology
Dr. Barry O'Connor
Gastroenterology
Dr. Gerard O'Connor
Emergency Medicine
Dr. John O'Dea
Cardiology
Prof. Martin O'Donohoe
Vascular Surgery
Mr. Fergal O'Duffy
ENT, Otolaryngology
Prof. Tadhg O'Dwyer
ENT
Prof. Peter O'Gorman
Haematology
Prof. Conor O'Keane
Pathology
Dr. Francis O'Keeffe
Emergency Medicine
Dr. Colman O'Loughlin
Anaesthesia
Mr. Padhraig O'Loughlin
Orthopaedics
Mr. Kiaran O'Malley
Urology
Prof. Yvonne O'Meara
Nephrology
Dr. Brian O'Moore
Neurology, Neurophysiology
Dr. Brian O'Neill
Oncology (Radiation Oncology)