Dr Clive Onnie

Dr Clive Onnie

BSc (Hons), MSc, PhD, MRCP


26 years of experience
15 years as a specialist

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“Dr Onnie is a very kind, caring and knowledgeable gastroenterologist I feel very confident in his care His secretary is amazing and both she and Dr Onnie go out of their way to help I’m any way that they can. I would highly recommend Dr Onnie “
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  • General (Internal) Medicine
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Languages spoken

  • English
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Registered with

  • General Medical Council: 4315311
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    Practices worked at

    The Wellington Hospital

    St Johns Wood, London, United Kingdom, NW8 7JA
    1,668 reviews

    Golders Green Outpatients and Diagnostics Centre

    Roman House, Roman House, 296 Golders Green Rd, London, United Kingdom, NW11 9PY
    510 reviews


    Dr Clive Onnie is a Consultant Gastroenterologist at the Whittington Hospital NHS Trust since 1997. He qualified from The London Hospital Medical School with distinction and continued his postgraduate training at St Mark's Hospital and Guys and St Thomas Hospital. He undertook a Masters in Medical Science at the Hammersmith hospital and obtained his PhD from Kings College, London, studying the genetics of inflammatory bowel disease. He was awarded a Digestive Diseases Foundation Research Fellowship. Dr Onnie is also Honorary Senior Lecturer at the University College London Medical School and the medical adviser to the North London Chapter of the Crohn's and Colitis UK Organisation.

    Dr Onnie sees patients with all aspects of general gastroenterology conditions. He is an expert in the management of inflammatory bowel disease, irritable bowel syndrome, dyspepsia and reflux. He applies a holistic approach to the treatment of bowel problems, combining conventional and alternative medicine with particular emphasis on the importance of diet. 

    Dr Onnie is actively involved in research and is particularly focused on the genetics of inflammatory bowel disease and colorectal cancer. He has published extensively in some of the most renowned medical journals and has also co-authored several book chapters. 








    Diseases, Medical Tests and Treatments
    • Gastroscopy OGD
    • Colonoscopy
    • Flexible sigmoidoscopy
    • ERCP
    • Video capsule endoscopy
    • Irritable Bowel Syndrome (IBS)
    • Inflammatory Bowel Disease (IBD)
    • Reflux
    • Dyspepsia


    • Colonoscopy
    • Gastroscopy
    • ERCP Procedure
    • Endoscopy (OGD)
    • Sigmoidoscopy
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    Special interests

    • Inflammatory Bowel Disease (IBD)
    • Irritable Bowel Syndrome (IBS)
    • Dyspepsia (Indigestion)
    • Gastro-oesophageal Reflux Disease (GORD)
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    • MBBS - The London Hospital Medical School 
    • PhD - Kings College, London
    • MRCP 
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