25 February – RMS Laconia (1911) sunk by U-50 6 nmi (11 km) northwest of Fastnet Rock; twelve killed.
7 March – David Lloyd George announces that Britain is ready to confer self-government to the parts of Ireland that want it. The north-eastern part will not be "coerced".
17 March – Booth Line armed merchant liner SS Antony inward bound from South America torpedoed and sunk by UC-48 19 nmi (35 km) west of Coningbeg lightship; 55 killed.[2]
20 March – a motion to reduce the salary of the British prime minister by £100 is introduced in the British House of Commons as a protest against the refusal to publish the proceedings of the 1916 Rising courts martial.
16 May – British prime minister, David Lloyd George, announces that he wants immediate Home Rule for the 26 counties. Six north-eastern counties are to be excluded for a period of five years.
16 July – the Round Room in the Mansion House, Dublin, is filled to capacity as the leaders of Sinn Féin demand the bodies of the Easter Rising leaders so that they can be given a Christian burial.
25 October – 1,700 Sinn Féin delegates attend a convention in the Mansion House and De Valera replaces Arthur Griffith as the organisation's president.
15 December – Cargo ship SS Formby bound for Waterford from Liverpool is 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 is sunk nearby by the same German submarine with the loss of all 15 crew.[3]
Undated – Scoil Bhríde, Ranelagh, 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.
^Helgason, Guðmundur. "Ships hit during WWI: Coningbeg". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net.
^Robinson, Patrick (2007). Film Facts. Wigston: Quantum Books. p. 12. ISBN 978-1-84573-235-6.