Dame Sara Joanne Thornton, (born 27 December 1962) is the current UK's Independent Anti-Slavery Commissioner.
She was appointed by the Home Secretary at the time, Sajid Javid, in succession to Kevin Hyland who left the post in May 2018.She is a retired British police officer who was the first Chair of the National Police Chiefs' Council (NPCC) and the former Chief Constable of Thames Valley Police and Vice-President of the Association of Chief Police Officers (ACPO).
She was the second consecutive head of the Thames Valley Police to move onto leadership of a national policing body; at Thames Valley she replaced former Chief Constable Peter Neyroud who, in January 2007, moved to the role of Chief executive of the National Policing Improvement Agency.