Total number of executions in Northern Ireland during the 20th century was 16.
| Date | Name | Prison | Victim(s) | Hangman |
| 11/01/1901 | William Woods | Belfast | Bridget McGivern | Thomas Scott |
| 05/01/1904 | Joseph Moan | Londonderry | Rose Ann McCann | William Billington |
| 22/12/1904 | Joseph Fee | Armagh | John Flanagan | Henry Pierrepoint |
| 20/08/1908 | John Berryman | Londonderry | William Berryman, Jean Berryman | Henry Pierrepoint |
| 19/08/1909 | Richard Justin | Belfast | Annie Thompson | Henry Pierrepoint |
| 17/08/1922 | Simon McGeown | Belfast | Margaret (Maggie) Fullerton | John Ellis |
| 08/02/1923 | William Rooney | Londonderry | Lily Johnston | William Willis |
| 08/05/1924 | Michael Pratley | Belfast | Nelson Leech | William Willis |
| 08/08/1928 | William Smiley | Belfast | Margaret Macauley, Sarah Macauley | Tom Pierrepoint |
| 08/04/1930 | Samuel Cushnan | Belfast | James McCann | Tom Pierrepoint |
| 31/07/1931 | Thomas Dornan | Belfast | Isabella Aitken, Margaret Aitken | Tom Pierrepoint |
| 13/01/1932 | Eddie Cullens | Belfast | Achmet Musa | Tom Pierrepoint |
| 07/04/1933 | Harold Courtney | Belfast | Minnie Reid | Tom Pierrepoint |
| 02/09/1942 | Thomas Joseph Williams | Belfast | Patrick Murphy | Tom Pierrepoint |
| 25/07/1961 | Samuel McLaughlin | Belfast | Nellie (Maggie) McLaughlin | Harry Allen |
| 20/12/1961 | Robert McGladdery | Belfast | Pearl Gamble | Harry Allen |
All of these hangings were for murder. There were 12 executions at Crumlin Road prison, Belfast, three at Londonderry and one at Armagh. (A total of 17 men were hanged at Crumlin Road prison between 1854 and 1961). Albert Browne, a member of the Ulster Defence Association (UDA), was found guilty of killing a member of the Royal Ulster Constabulary (RUC) in October 1972 for which he was sentenced to death but this was later commuted to life imprisonment. 19 year old Liam Holden, who had killed a soldier, was the last person to receive the death sentence in Northern Ireland and this was also commuted in July 1973. The death penalty was abolished in 1973 as part of the Emergency Provisions Act. Crumlin Road prison closed in March 1996 and has since re-opened as a tourist attraction.
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