Mr Daniel O'Leary

Consultant Colorectal Surgeon

MB (Hons), BSc (Hons), MCh, FRCSI (Gen)


Specialises in

I have been a consultant in Portsmouth since 1999. I am a General Surgeon with a major interest in colorectal surgery. My clinical work involves emergency surgical care and elective management of patients with colorectal disease. My private practice is based at Spire Portsmouth Hospital, where I have a weekly clinic, operating sessions and colonoscopy facilities.

Benign and malignant colorectal disease account for the majority of my NHS and private practice. Much of my elective practice has concerned complex and re-operative surgery including intestinal failure.

I have held several positions that have enabled me to improve surgical care in Portsmouth including Surgical Lead, Surgical High Care Unit, Portsmouth Hospitals NHS Trust.

I graduated with honors from University College Dublin and trained in surgery at FRCSI. I then completed a Research Fellowship at Boston University, USA. I completed my higher surgical training in Bristol and the South West. And completed training in colorectal surgery at St Mark’s Hospital, London – the pre-eminent referral centre for complex colorectal disease in the UK.

I obtained first place and the Gold Medal of the Association of Surgeons of Great Britain and Ireland in the Intercollegiate Examination in Surgery 1997. I have written chapters in 4 books and have written or collaborated on 37 Peer-reviewed publications. I am a former trainer for M27 Coloproctology course.

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Treatment information

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

General surgery

Other treatments

  • Anti-wrinkle treatment for anal fissures
  • HALO/THD procedure for Haemorrhoids
  • Lay-open or plug for anal fistulas
  • Proctology

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Additional information

Colorectal surgery

Rectal bleeding, Haemorrhoids (piles), anal fissure, perianal abscess, anal fistula, colonoscopy, bowel incontinence, rectal prolapse, abdominal pain, evaluation and investigation of abdominal pain, change in bowel habit, rectal bleeding, anorectal symptoms.

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
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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

Senior Staff Group, Portsmouth Hospitals NHS Trust


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 Ileostomy Association
Lead clinician for Colorectal Cancer Services for Portsmouth NHS Trust (2003 - 2014)
Clinical Director of the Colorectal Unit (2005 – 2010) and Clinical Lead (2013 - 2015)
Chair of Colorectal Site Specific Group of the Central South Coast Cancer Network (2003 - 2009)
Lead Clinician Joint Anal Cancer MDT Portsmouth and Chichester (2007- 2020)
Surgical Lead, Surgical High Care Unit, Portsmouth Hospitals NHS Trust

  • Anti-wrinkle treatment for anal fissure
  • Improving outcomes for colorectal cancer
  • Improved staging of colorectal cancer and accelerated recovery programme after colorectal surgery
  • MDT decision-making in colorectal cancer
  • Quality of life in colorectal cancer management

Consultant General and Colorectal Surgeon, Portsmouth Hospitals NHS Trust (1999-present)

Honorary Senior Lecturer in Surgery, the University of Portsmouth until 2011

His wife is a doctor; they have four children. When he is not working Mr O'Leary enjoys spending time with his family, DIY and walking.

Private secretary Michele Murphy
Private secretary telephone 02392 352 206
Private secretary email michele.murphy597@ntlworld.com