In his early years as a priest, D'Arcy took it on himself to become an unofficial chaplain to the showbusiness community in Dublin, visiting dancehalls seven nights a week and hearing confessions from musicians and fans alike. Such was his fame during this period that he reportedly became the inspiration for Dermot Morgan's character, Father Trendy. D'Arcy has publicly opposed the existing disciplinary norms regarding clerical celibacy and has sought the possibility to ordain married priests. Concerns have been expressed by the Vatican's Congregation for the Doctrine of the Faith about some aspects of D'Arcy's writing; he was warned in April 2012 that he must now submit his writings and broadcasts to an official censor. D'Arcy has been a prominent supporter of Seán Quinn and his family in their court battles with the Irish state. D'Arcy controversially spoke at a rally in July 2012 in protest against the High Court finding Sean Quinn Jnr and his cousin Peter Darragh Quinn were found in contempt of court for not complying with its order to produce the €451 million they had moved out of the state while owing it to the state. While Seán Jnr served his prison time, Peter Quinn became a fugitive and is currently at large in D'Arcy's pastoral area of Enniskillen: in 2013 the High Court found Peter Quinn personally liable to repay €145 million of the money he illegally put out of reach of his creditors. D'Arcy was a long-term friend of BBC Radio 2 presenter Terry Wogan, officiating at the weddings of his children. D'Arcy said that Wogan was atheist but spiritual, and that God would admit him to Heaven.
Media career
D'Arcy hosts a weekly radio programme on BBC Northern Ireland called Religion and Ethics on the air. Since July 1976 he has written the "Father Brian's Little Bit of Religion" column for the Sunday World. On 15 April 2007, D'Arcy replaced Canon Roger Royle on the long-standing BBC Radio 2 show Sunday Half Hour. On 23 January 2012, the BBC announced that D'Arcy would step down from this role and Diane-Louise Jordan would succeed him. He left the show on 29 January 2012. On 8 September 2010, D'Arcy appeared on the prime-time BBC 1 programme The One Show discussing the Pope's upcoming trip to the United Kingdom.
Awards
D'Arcy received an honorary degree from the University of Ulster. Fr. Brian D'Arcy was awarded an OBE in June 2019
After the publication of the Murphy Report, D'Arcy accused the Vatican of hiding behind legal procedures in not dealing with allegations of child abuse within the church. Following the report's publication he has called for a radical re-formation of the church's structures and resignations of high-ranking figures within the Irish Catholic Church.