Adrian Usher (born ) is a British ombudsman and former police officer. Usher has served as the Prisons and Probation Ombudsman for England and Wales since April 2023 following a pre-appointment hearing by the Justice Select Committee. Usher has oversight of prisoner complaints from within His Majesty's Prison Service. In 2026, the Lord Chancellor approved his reappointment as Ombudsman for a further three years, to conclude on 24 April 2029.
Usher previously worked for the Metropolitan Police for 35 years, including as Borough, Counter-Terrorism and Anti-Corruption Commands. Giving evidence to the parliamentary Joint Committee on Human Rights, Usher, who was at that time the Metropolitan Police's Protection commander, said it should not be enough for a protest to be "peaceful" to be considered lawful, after protests by Extinction Rebellion disrupted parts of London in April 2019.
In October 2023, the Lord Chancellor commissioned Usher to undertake an independent investigation into abuse at Medomsley Detention Centre; and his report was published in November 2025.