Gillian Leng

Gillian Leng, Lady Cosford CBE
Born	Gillian Catherine Leng
Education	University of Leeds
Known for	Former Chief Executive, National Institute for Health and Care Excellence (NICE) President of the Royal Society of Medicine (2024)
Relatives	Sir Paul Cosford (spouse)
Medical career
Profession	Physician
Field	Public health
Institutions	National Institute for Health and Care Excellence King's College London University of Leeds National University of Singapore Royal Society of Medicine

Gillian Catherine Leng, Lady Cosford CBE is a British health administrator, academic, visiting professor at King's College London and the former Chief Executive of the National Institute for Health and Care Excellence (NICE), where she was responsible for several programmes and guidelines including the guidelines on COVID-19. In 2024 she became president of the Royal Society of Medicine (RSM).

She has been involved in the Cochrane collaboration since its foundation, and has worked on clinical trials and epidemiological research in public health medicine. She also teaches at the NUS Saw Swee Hock School of Public Health.