Mr Diarmuid O'Riordain

Consultant Colorectal

Secretary: Olive or Christine, Practice Manager: Karen

Areas of Specialty

  • General Surgery
  • Colorectal Surgery
  • Surgical Oncology
  • Robotic Surgery
  • Laparoscopic Surgery
  • Transanal Surgery
  • Colorectal Polyps
  • Complex Anal Fistulae
  • Stoma Surgery

Current Memberships

  • Society of Surgical Oncology USA
  • Surgical Discussion Group
  • Association of Coloproctology of Great Britain and Ireland
  • International Society of Surgery
  • European Academy of Robotic Colorectal Surgery
  • Irish Society of Coloproctology


Mr. Ó Ríordáin is a graduate of University College Cork and having completed a Senior Registrar training programme in Colorectal and General Surgery in Ireland, and attaining Specialist Fellowship of the RCSI, he then moved to the United States for further senior clinical and research experience in Colorectal and Oncologic Surgery. Mr. Ó Ríordáin trained at some of the leading academic medical centres in the United States including The Mayo Clinic, Brigham and Women’s Hospital, Harvard Medical School and Memorial Sloan Kettering Cancer Centre in New York where he was awarded the prestigious and competitively awarded International Fellowship in Surgical Oncology, where he specialised in gastrointestinal oncology.


In 1998 Mr. Ó Ríordáin moved from the US to the UK, to take up the post of Consultant Surgeon and Senior Lecturer at St James’s Hospital in Leeds, a major teaching hospital of the largest NHS Trust in the UK, and at the University of Leeds Medical School. Here, Mr. Ó Ríordáin played a lead role in the development and organization of the Gastrointestinal and Colorectal Cancer Surgical service, Laparoscopic Surgery Programme and lead the development of the Multidisciplinary Gastrointestinal Cancer team. In 2001 Mr. Ó Ríordáin moved back to Ireland. Mr Ó Ríordáin has since set up his private practice in Beacon Hospital.

Mr. Ó Ríordáin’s research interests include Colorectal Cancer, Multidisciplinary Cancer Care, Robotic and Laparoscopic Colorectal Surgery. He was awarded a Doctorate in Medicine NUI 1993 for his thesis based on research in surgical immunology. He has authored more than 60 peer reviewed scientific surgical articles and over 100 lectures and presentations to learned societies in Ireland and Internationally.

He takes an active involvement in undergraduate and postgraduate teaching. He is affiliated to the medical schools at Trinity College through Tallaght University and Naas Hospitals and at University College Dublin through Beacon Hospital.