25 February – The RMS Laconia (1911) was sunk by U-50 6 nmi (11 km) northwest of Fastnet Rock; twelve were killed.
7 March – Prime Minister David Lloyd George announced that Britain was ready to confer self-government to the parts of Ireland that wanted it. The north-eastern part would not be "coerced".
17 March – Booth Line armed merchant liner SS Antony inward bound from South America was torpedoed and sunk by UC-48 19 nmi (35 km) west of Coningbeg lightship; 55 were killed.[2]
20 March – A motion to reduce the salary of the British prime minister by £100 was introduced in the British House of Commons as a protest against the refusal to publish the proceedings of the 1916 Easter Rising courts martial.
16 May – Prime Minister Lloyd George announced that he wanted immediate Home Rule for the 26 counties. Six north-eastern counties were to be excluded for a period of five years.
16 July – The Round Room of the Mansion House in Dublin was filled to capacity as the leaders of Sinn Féin demanded the bodies of the Easter Rising leaders so they could be given a Christian burial.
25 October – Seventeen hundred Sinn Féin delegates attended a convention in the Mansion House where Éamon de Valera replaced Arthur Griffith as the organisation's president.
15 December – Cargo ship SS Formby bound for Waterford from Liverpool was torpedoed and sunk in the Irish Sea by U-62 with the loss of all 35 crew. Two days later her sister, SS Coningbeg, making the same passage was sunk nearby by the same German submarine with the loss of all 15 crew.[3]
Undated – Scoil Bhríde in Ranelagh was founded as the first gaelscoil (Irish-language school).
^"Notable Dates in History". The Flag in the Wind. The Scots Independent. Archived from the original on 23 May 2014. Retrieved 15 July 2014.
^Helgason, Guðmundur. "Ships hit during WWI: Antony". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 27 April 2016.