5.0 | 515 reviews
Specialises in: General surgery

Mr Oliver Warren was awarded the iWantGreatCare certificate of excellence in 2025 for delivering outstanding care.
Oliver is a Consultant Colorectal, Intestinal and Hernia Surgeon at Chelsea and Westminster Hospital, The London Clinic and The Lister Hospital. He has a high-volume practice in coloproctology and is a JAG accredited colonoscopist. He has an interest in hernias, including complex abdominal wall reconstruction. He performs over 50 colorectal resections per year, the vast majority using 'keyhole' surgery. Prior to becoming a consultant surgeon he undertook colorectal surgery fellowships at St. Mark's Hospital, London and the Royal Prince Alfred Hospital, Sydney. He was a visiting fellow at the Cleveland Clinic, USA. Oliver is an Honorary Senior Lecturer at Imperial College London and has written numerous scientific papers and book chapters on medical leadership, patient safety and surgical education. He is the co-author of the book 'Going into Hospital: A guide for patients, families and carers'.
Could not have wished to have been in better hands . A full diagnosis and explanation of the procedure ( including the benefits of robotics ) , rapid and pain- free post - op recovery and timely return to normal activity . Mr Warren’s ability to combine the use of leading - edge technology with traditional clinical values is particularly impressive .
2nd July 2026 | Written by patient at The Lister Hospital
Mr Warren, was fantastic from start to finish. He made me feel comfortable and at ease with what was going on, explained the options and next steps clearly, which made the process incredibly smooth. I would highly recommend him.
23rd June 2026 | Written by patient at The Lister Hospital
Investigation of suspected hernia. Highly knowledgeable, great manner and clearly a leader in his field. Great approach.
18th June 2026 | Written by patient at Welbeck
Mr Warren was very good at explaining what he was going to do and why, without sounding condescending. He explained why it was the right approach and also any potential risk and recovery process. He was kind and treated me like an equal, with the right to understand and make decisions about my own body. He was highly recommended to me by a personal friend in Norway who said he was an expert in robotic surgery for abdominal hernias, so he is recognised for his skill internationally, but I was also really grateful for his brilliant bedside manner, which is not always the case with surgeons. I highly recommend him.
18th June 2026 | Written by patient at The Lister Hospital
I had a very positive experience with Mr. Warren and would highly recommend him. From my first appointment, he was professional, reassuring, and clear in explaining my condition and treatment options. The whole process moved quickly and efficiently, which was greatly appreciated. The surgery was successful, and I have been happy with the outcome.
9th June 2026 | Written by patient at Welbeck
Excellent surgeon who guided me through the original diagnosis with clarity and detail, ensuring I fully understood the procedure and what to expect. The surgery itself was a complete success, and Oliver was always available afterwards to explain exactly what had been done and answer any questions I had. Since the operation, I have experienced no side effects and already feel ready to get back to the gym thanks to Oliver’s outstanding work and care throughout the process. I would highly recommend him.
25th May 2026 | Written by patient at The Lister Hospital
My colonoscopist of over 20 years retired suddenly. Finding a replacement specialist was not easy as well as being technically competent, that person needed to be someone who I could relate to and trust. Men don't like talking about such matters and it was my GP, Emma, who reccomended Mr Oliver Warren. Hesitant at first, my initial meeting was extremely reassuring, all options and pathways were discussed. The appointment was not rushed, the staff were very pleasant and I left his surgury with a clear understanding of the path forward. I underwent a banding procedure as a day case tho I was not more than a few hours in the clinic. He and his team were superb, friendly, reassuring and extremely competent. The procedure six months on has been a huge success with the outcome better than I expected, overall I am delighted to be under his care and would not hesitate reccommeding Mr Oliver Warren
21st May 2026 | Written by patient at Welbeck
Mr Warren has been incredibly helpful in the past couple of months. A first-rate bedside manner and clearly one of the best there is in this speciality, his support has been very reassuring. I can't recommend him highly enough and would certainly visit him again for anything that falls within his area of expertise.
20th May 2026 | Written by patient at Welbeck
I have no hesitation in recommending Mr Oliver Warren as a highly experienced and competent surgeon. I was admitted to the Chelsea and Westminster Hospital where Mr Warren performed an operation for the repair of a large complex abdominal wall hernia. I was very impressed at the efficient service of Mr Warren's Hospital team, the nursing staff and by my speedy recovery. I am now out shopping etc on a regular basis and feeling a sense of building up a new life. I am delighted to be feeling so much better and very grateful to Mr Warren and his team.
19th May 2026 | Written by patient at Chelsea and Westminster Hospital
Dr Warren was kind and he is brilliant at what he does. I had several surgeries under his care all of which were successful. I'm very grateful.
15th May 2026 | Written by patient at Chelsea and Westminster Hospital
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