4 February – British police discovered an IRA bomb factory in Liverpool.
10 February – The three IRA terrorists involved in the 1975 Balcombe Street Siege in London were sentenced to life imprisonment on six charges of murder.
21 February – A crater on the planet Mercury was named after the Irish poet W. B. Yeats.
10 September – Irish horses were prevented from entering the United States because of an outbreak of venereal disease in Irish, British and French horses.[2][3]
18 September – In Ennis, County Clare, the Christian Brothers celebrated their 150th anniversary.
3 October – Dunsink Observatory near Finglas was badly damaged by fire. Rubble removed to the nearby municipal dump included valuable Apollo 11Moon rock fragments donated to Ireland by the American government.[4][5]
22 October – A new £1 note was circulated, a green banknote depicting the mythical Queen Maeve of Connacht.
^"Dáil Éireann". Parliamentary Debates. 300. 5 July 1977. Archived from the original on 2 March 2012. Retrieved 24 April 2012.
^Swerczek, T. W. (1979). "Contagious equine metritis – outbreak of the disease in Kentucky and laboratory methods for diagnosing the disease". J Reprod Fertil Suppl. 27 (27): 361–5. PMID 383988.
^"U.S. Importation of Mares and Stallions U.S.D.A. Quarantine Requirements Regarding Infectious Equine Diseases". cemquarantine.com. Archived from the original on 28 September 2007.
^What has happened to Nasa's missing Moon rocks? From lunar landscape to Dublin dump BBC World Service, 19 February 2012.
^Dunsink Obseratory—Outbreak of Fire, 3 October 1977 Irish Astronomical Journal, Vol. 13, p.156. March 1978.
^McElroy, James (2007). Ireland: A Traveler's Literary Companion. Whereabouts Press. p. 147.