The Government of Ireland Act 1914 (4 & 5 Geo. 5. c. 90), also known as the Home Rule Act, and before enactment as the Third Home Rule Bill, was an Act passed by the Parliament of the United Kingdom intended to provide home rule (self-government within the United Kingdom) for Ireland. It was the third such bill introduced by a Liberal government during a 28-year period in response to agitation for Irish Home Rule.

The Act was the first law ever approved by the Parliament of the United Kingdom that provided for a devolved government in any part of the UK proper (as opposed to colonial territories). However, the implementation of both it and the equally controversial Welsh Church Act 1914 was formally postponed for a minimum of twelve months with the beginning of the First World War. The continuation of the war beyond 1915 and subsequent developments in Ireland resulted in further postponements, meaning that the Act never became effective; it was finally superseded by a fourth home rule bill, enacted as the Government of Ireland Act 1920, which partitioned Ireland, creating Northern Ireland and Southern Ireland, both intended to have Home Rule.

During 1909, a constitutional crisis began when the House of Lords rejected David Lloyd George's Finance Bill. Two general elections occurred in January and December 1910, both of which left the Liberals and Conservatives equally matched, with John Redmond's Irish Parliamentary Party having the balance of power in the House of Commons. The Irish Parliamentary Party, which had campaigned for home rule for Ireland since the 1870s, pledged to assist the Liberals in return for the introduction of a home rule bill. The Parliament Act 1911 then replaced the unlimited veto of the Lords with one lasting only 2 years, ensuring that a bill passed by the Commons could not be blocked for more than two years.

The Prime Minister, H. H. Asquith, introduced the Bill on 11 April 1912. Allowing more autonomy than its two predecessors, the bill provided that:

The financial situation was a concern. Irish taxes had yielded a surplus of £2 million in 1893, but by 1910 that had become a current spending net deficit of £1.5m, which had to be raised by London. An annual "Transferred Sum" mechanism was proposed, so that public spending in Ireland could be continued at the same level.

The Bill was passed by the Commons by a majority of 10 votes in 1912, but in January 1913 the House of Lords rejected it by 326 votes to 69. Later in 1913, it was reintroduced and again passed by the Commons and rejected by the Lords, this time by 302 votes to 64. In 1914, after the third reading, the Bill was passed by the Commons on 25 May 1914 by a majority of 77. Having been defeated a third time in the Lords, the Government used the provisions of the Parliament Act 1911 to override the Lords and send the bill for royal assent.

Unionists in Ulster were opposed to a home-rule Ireland governed from Dublin. Hostility to the Home Rule Bill was increasing in the counties of Antrim, Armagh, Down, and Londonderry. Early in 1912, some of the residents of that area began forming small local militias. By April 1912, the Irish Unionist Alliance's managing politician, Sir Edward Carson, could review 100,000 marching Ulster Volunteers. On 28 September 1912, more than 500,000 Unionists signed the Ulster Covenant pledging to defy Home Rule by all means possible. The Covenant was developed by Carson and organised by Sir James Craig. This Covenant specifically pledged not to acknowledge any Parliament out of Dublin, nor to obey its laws, nor pay any taxes levied by its government. This would be problematic especially since Ulster was the wealthiest and most prosperous part of Ireland.

In January 1913, the Unionist Council reorganised their volunteers into a paramilitary Ulster Volunteer Force (UVF), whose members threatened to resist by physical force the implementation of the Act and the authority of any restored Dublin Parliament by force of arms. On 28 November 1913, Irish Nationalists responded by forming the Irish Volunteers "to secure the rights and liberties common to all the people of Ireland". The government's willingness to effectively oppose the Unionist threat was rendered highly questionable by the Curragh Mutiny of 20 March 1914, when many British Army officers at Curragh in County Kildare, the main Army camp in Ireland, threatened to resign or accept dismissal rather than deploy against the Ulster Volunteers, forcing the government to cancel planned troop movements.