Rosena Brown (Irish: Róisín De Brún; born c.1945) is an Irish actress of television, cinema, and stage from Belfast, Northern Ireland who also served as an intelligence officer for the Provisional IRA. Dubbed the "IRA Mata Hari", she was named in the murder trial of prison officer John Hanna, who was charged and convicted of helping the IRA kill colleague Brian Armour. She allegedly persuaded Hanna into providing information on Armour which she then passed on to the IRA; however, she was not charged with complicity in Armour's murder. In 1992, she and two men were arrested when a booby-trap bomb was found in their car. In 1993, she was sentenced to 20 years' imprisonment, but was released in December 1998 under the terms of the Good Friday Agreement.