Born on a farm in County Down, Morrow was an early member of the ecumenical Corrymeela Community, later led by his brother John  and his cousin Robert Morrow who starred in the television show Northern Exposure.
Morrow was an early member of the Alliance Party of Northern Ireland (APNI), and was elected to Castlereagh Borough Council in 1973, holding his seat at each subsequent election, until standing down in 1989.
In 1982, Morrow was elected to the Northern Ireland Assembly, representing Belfast East. At the 1983 general election, he stood unsuccessfully in Strangford, taking 15% of the vote. In 1984, under John Cushnahan, Morrow became APNI's deputy leader.
At the 1987 general election, Morrow increased his share of the vote in Strangford to 20%. For the 1992 general election, he switched to contest North Down, taking just under 15%. Morrow became APNI's chair, but stood down in 1993, citing disappointment at the failure of other parties to use the Brooke-Mayhew Talks to reach agreement. Morrow later became APNI's President. Morrow died on 30 March 2012 in his family home on the farm he was brought up in. He was 83 years old.
- Ex-Alliance Party deputy leader Addie Morrow dies, BBC News, 30 March 2012
- John Morrow, On the Road of Reconciliation: A Brief Memoir
- M. A. MacIver and E. H. Bauermeister"Bridging the Religious Divide: Mobilizing for Reconciliation in Northern Ireland", Review of Religious Research, 1990
- The Local Government Elections 1973-1981: Castlereagh, Northern Ireland Elections
- Local Government Elections 1985 - 1989: Castlereagh, Northern Ireland Elections
- ElectionsIreland.org: Addie Morrow
- The 1995 North Down By-Election
- Chronology 1993, Centre d'Etudes Irlandaises - Université Rennes 2
- D. T. Denver, British Elections & Parties Review: The General Election of 1997
- Alliance's Addie Morrow dies at 83 (UTV News)
|Party political offices|
|Deputy Leader of the Alliance Party of Northern Ireland