The O'Brien Institute is a building complex off the Malahide Road, near Mount Temple Comprehensive School in Marino, Dublin, Ireland. Built in 1880–1883 as an orphan home and school, the purchase of the land, and building costs, were financed by a trust that was founded by the will of Bridget O'Brien in 1876. The last four boarders left in 1976, when the school, which was run by the Irish Christian Brothers, closed. The institute was bought by Dublin Corporation, and is currently primarily used by Dublin Fire Brigade as a training centre, while the educational trust continues within the Archdiocese of Dublin.

Dublin Fire Brigade is the fire and rescue service and ambulance service for County Dublin, including Dublin city, in Ireland. It is a local authority service, operated by Dublin City Council on behalf of that council and those of Fingal, Dún Laoghaire–Rathdown and South Dublin. There are currently 14 fire stations staffed by DFB, 12 of which are full-time, the other 2 are "retained" and operate on call 24/7 365 days a year with up to 500 calls per year. Full-time stations are staffed by shifts across 4 watches. There are currently over 963 active firefighter/paramedic personnel making it by far the largest fire service based on personnel and resources in Ireland.