Fiona O'Carroll is an Irish actress and a 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.

O'Carroll was born in Dublin in Ireland, her younger brothers are Danny and Eric.

O'Carroll's stepmother is the Irish actress Jennifer Gibney, the wife of her father Brendan O'Carroll.

O'Carroll has been a cast member of Mrs. Brown's Boys portraying Maria Brown since its inception. 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, O'Carroll was also in the ITV drama The Widower.

September 2022 Fiona took part in the gruelling reality show TV "Special Forces Ultimate Hellweek", a show which pushes contestants to their physical and mental limits. She has since described the experience as life changing.

Next up in 2022 Fiona starred as Gretchen Ackerman in the hugely successful touring production of "Coppers the Musical"

2023 saw Fiona starring in the award winning Jason Branagan short film "Picture Day"

Later in 2023 Fiona then played the part of Linda in Western Front Studios "They can't know about me" directed by Michael Carolan.

O'Carroll married her Mrs. Brown's Boys co-star, Martin Delany, who is originally from Australia, on 18 May 2006. They have four sons together. Three of her sons are autistic.^[1] In December 2021, she announced her split from Delany.^[2]

Delany now lives in Portugal following his divorce with O'Carroll and they were reunited during the Christmas of 2021.

O'Carroll has two nephews as her brother, Danny O'Carroll, has two sons.^{[citation needed]}

In August 2017, O'Carroll completed a 260-mile walk from Cork to Belfast in aid of Billy's World, a charity for children with special needs.^[3]

Her aunt Fiona O'Carroll, a sister of her father Brendan, died in 2020 in Canada.^[4]