Prof Diarmuid O'Riordain

Consultant in Colorectal, Minimally Invasive and General Surgery
Diarmuid O Riordain Headshot

Secretary: Dee, Practice Manager: Christine

Areas of Specialty

  • Robotic Colorectal Surgery
  • Laparoscopic Colorectal Surgery
  • Inflammatory Bowel Disease
  • Diverticular Disease
  • Transanal Polyp and Cancer Surgery
  • Complex Anal Fistulae
  • Stoma Surgery
  • Laparoscopic Hernia Surgery
  • Gallbladder Surgery
  • General Surgery
  • Colorectal Surgery
  • Colorectal Cancer

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


Prof Ó Ríordáin is a graduate of University College Cork and having completed surgical training in Colorectal and General Surgery in Ireland, and attaining Specialist Fellowship of the RCSI, he moved to the United States for further senior clinical and research experience in Colorectal and Oncologic Surgery. Prof 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 International Fellowship in Surgical Oncology, his specialist interest being gastrointestinal oncology.


In 1998 Prof 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, Prof 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 Prof Ó Ríordáin returned to Ireland as Consultant Colorectal Surgeon at Tallaght University Hospital. Since its inception in 2006 Prof Ó Ríordáin has been Consultant Surgeon at Beacon Hospital and Clinic and run his private practice from there. Since then he has led the Colorectal service and Gastrointestinal multidisciplinary team at Beacon Hospital and was Chairman of Department of Surgery from 2008-2014. He was to the fore in the development of Laparoscopic Colorectal Surgery in Ireland in the early 2000’s and likewise in the development of Robotic Colorectal surgery in Ireland, being the first accredited robotic colorectal surgeon in the country in 2017.

Prof 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. Prof Ó Ríordáin is Associate Clinical Professor of Surgery at UCD School of Medicine and also lectures in surgery at the School of Medicine, Trinity College Dublin through his affiliation to Tallaght University and Naas Hospitals.