The Irish Church Act 1869 receives British royal assent on July 26, 1869. The Act is an act of the Parliament of the United Kingdom which separates the Church of Ireland from the Church of England and disestablishes the former, a body that commands the adherence of a small minority of the population of Ireland. The Act is passed during the first ministry of William Ewart Gladstone and comes into force on January 1, 1871. It is strongly opposed by Conservatives in both houses of Parliament.

The Act means the Church of Ireland is no longer entitled to collect tithes from the people of Ireland. It also ceases to send representative bishops as Lords Spiritual to the House of Lords in Westminster. Existing clergy of the church receive a life annuity in lieu of the revenues to which they are no longer entitled: tithes, rentcharge, ministers’ money, stipends and augmentations, and certain marriage and burial fees.

The passage of the Bill through Parliament causes acrimony between the House of Commons and the House of Lords. Queen Victoria personally intervenes to mediate. While the Lords extort from the Commons more compensation to alleviate the disestablished churchmen, in the end, the will of the Commons prevail.

The Irish Church Act is a key move in dismantling the Protestant Ascendancy which had dominated Ireland for several centuries previously.