Killester is a small residential suburb of Dublin, Ireland on the Northside of the city in the Dublin 3 and Dublin 5 postal districts. It was the site of a church and convent or monastery centuries ago, and later a small village developed. In 1922, a settlement for ex-servicemen and their families was established, and the area grew with suburban housing later. The local parish church has for many years hosted a relic of St Brigid.