St Columba's College is a co-educational independent day and boarding school founded in 1843 located in Whitechurch, County Dublin, Ireland.

The school has grown up around a series of quadrangles, and major developments since the 1993 150th anniversary have provided it with many modern facilities.

Academic standards are high; in 2006, the average points score by all Leaving Certificate candidates was 440 out of 625, and in 2007 this went up slightly to 442.

Older boys and girls, selected by the house staff, help to provide an existence more structured and more protected than that of the rest of the school.

There are also shorter half-term breaks in the other terms, including following the St Columba's Day celebrations in late May or early June.

Each term there is a three- or four-day Exodus during which the college closes; most pupils from outside of Ireland stay with their guardians, or Irish school friends.

Many OCs were officers in the British Army, so that when one of them died the bell in college was rung in commemoration.

Regular dinners and drinks parties are organised, in Dublin, London and Belfast.