Robert John "R. J." Kerr (c. 1943 – 8 November 1997), was a leading Northern Irish loyalist. He served as the commander of the Portadown battalion of the Ulster Defence Association's Mid-Ulster Brigade. Along with the Mid-Ulster Ulster Volunteer Force's brigadier Robin Jackson, Kerr was implicated in the killing of Catholic chemist William Strathearn. Royal Ulster Constabulary Special Patrol Group officers John Weir and Billy McCaughey named him as one of their accomplice; however, neither Kerr nor Jackson were questioned by police or brought before the court, for "reasons of operational strategy". Weir and McCaughey were convicted of Strathearn's killing.