Mr Daniel O'Leary

Consultant colorectal and general surgeon


Specialises in

I have been a consultant surgeon in Portsmouth for 20 years, with a specialist interest in colorectal surgery and a major commitment to emergency abdominal surgery. My ongoing clinical aim is to improve the care and outcomes of patients with colorectal disease, especially following colorectal surgery.

I have been instrumental in the provision of a Surgical High Care Unit, Enhanced Recovery Programme, Surgical Skills Lab and National Training Programme in laparoscopic colorectal cancer surgery in Portsmouth. My outcomes for cancer surgery are submitted independently to the National Bowel Cancer Audit and are within the expected range.

Benign and malignant colorectal disease account for the majority of my NHS and private practice. My private practice is based at Spire Portsmouth Hospital, where I have a weekly clinic, operating sessions and colonoscopy facilities.

After medical school at University College Dublin, I trained to FRCSI in Ireland. I then undertook a research fellowship at Boston University. I returned as a lecturer in surgery in Sheffield and did higher surgical training in Bristol and the South West.

I completed training in specialist coloproctology at St Mark's Hospital, London and in laparoscopic colorectal cancer surgery within the Lapco National Training Programme. I have written 35 peer-reviewed papers and four book chapters.

In 1997 I obtained first place in the Intercollegiate Examination - FRCSI(Gen) and the Gold Medal of the Association of Surgery of Great Britain and Ireland.


Treatment information

Some of the principal treatments carried out by Mr Daniel O'Leary at Spire include:

General surgery

Other treatments

  • Investigation of rectal bleeding 
  • Investigation of change in bowel habit 
  • Rectal prolapse surgery 
  • Surgery for colon cancer 
  • Investigation of abdominal pain 

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Important information about Covid-19 tests

Spire Portsmouth Hospital is only able to provide Covid-19 tests to patients undergoing surgery at our hospital. Covid-19 testing or antibody tests are not available as a standalone service.


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Additional information

Colorectal surgery

Special clinical interests: proctology, rectal bleeding, piles, fissures and fistulas, incontinence and prolapse, colorectal cancer, screening, polyps, inflammatory bowel disease, abdominal pain.

MB, BCh, BAO / University College Dublin (NUI) / 1982
(Hons, second class)

BSc anatomy / University College Dublin (NUI) / 1984
(First Class Honours)

MCh / University College Dublin (NUI) / 1992
(Master’s in Surgery)

FRCSI / Fellow of the Royal College of Surgeons of Ireland. / 1986
First place

FRCS / Fellowship of the Royal Colleges of Surgeons / 1992
ad eundum

FRCSI (Gen) / Fellow of the Royal College of Surgeons of Ireland. / 1997
First place

Professional memberships

Royal College of Surgeons

Royal College of Surgeons in Ireland

Association of Surgeons of Great Britain and Ireland

Association of Coloproctology of Great Britain and Ireland

St Mark’s Association

Professional leadership

Surgical Director Surgical High Care Unit, Queen Alexandra Hospital, Portsmouth
Lead Clinician Portsmouth/Chichester Multidisciplinary Team managing Anal Cancer
President Portsmouth and Isle of Wight branch of ia

Botulinum toxin for anal fissure, quality of life in colorectal cancer management, improved staging of colorectal cancer and accelerated recovery programmes after colorectal surgery.

Consultant General Surgeon, Portsmouth Hospitals NHS Trust.

Honorary Senior Lecturer in Surgery, University of Portsmouth.

My wife works with Portsmouth Cathedral Choir. We have four children and live in Waterlooville. When I'm not working I enjoy spending time with my family.

Private secretary Michele Murphy
Private secretary telephone 02392 352 206
Private secretary email