Fiona O'Carroll (born 14 September 1980) is an Irish actress and cast-member of the popular BBC/RTÉ sitcom, Mrs. Brown's Boys. Fiona is the daughter of Doreen O'Carroll and Mrs. Brown's Boys star and creator, Brendan O'Carroll.
Fiona has been a cast member of Mrs. Brown's Boys since its incarnation. Fiona has played the role of Maria Brown (née Nicholson) since the show's debut in 2011. She reprised her role in the 2014 film, Mrs. Brown's Boys D'Movie and the 2017 chat show All Round to Mrs. Brown's.
In 2014 Fiona was also in the ITV drama The Widower
Fiona married her Mrs. Brown's Boys' co-star, Martin Delany, on 18 May 2006. They have four sons together; Felix, Isaac, Eli and Dexter.
In September 2015, Fiona was involved in a road collision when her car struck a motorcyclist on a roundabout. In October 2017, Fiona was directed by a judge to pay €30,000 in damages.
In August 2017, Fiona completed a 260-mile walk from Cork to Belfast in aid of Billy's World, a charity for children with special needs.