Permission's been granted for a four-storey mosque in Blanchardstown.
The prayer centre would also be a facility for the Muslim community in west Dublin, and will feature a 95 feet-tall minaret for the call to prayer.
There had been some local opposition to the building of mosque on the site of Warrenstown House.
Concerns were raised about traffic and noise pollution but An Bord Pleanála has set out strict conditions.
The mosque is the vision of Dr Taufiq al Sattar, a Dublin-based neurosurgeon who's family was killed in an arson attack in Leicester in 2013.