Seamus Costello

Seamus Costello
Costello during a December 1975 interview with RTÉ
Wicklow County Councillor
In office March 1967 – October 1977
Constituency	Bray
Personal details
Born	1939 Old Connaught Avenue, Bray, County Wicklow, Ireland
Died	5 October 1977 (aged 38) North Strand, Dublin, Ireland
Political party	Irish Republican Socialist Party
Other political affiliations	Sinn Féin (1955–1970) Official Sinn Féin (1970–1974)
Spouse	Maeliosa Costello
Children	4

Seamus Costello (Irish: Séamus Mac Coisdealbha, 1939 – 5 October 1977) was an Irish politician. He was a leader of Official Sinn Féin and the Official Irish Republican Army and latterly of the Irish Republican Socialist Party (IRSP) and the Irish National Liberation Army (INLA).

He argued for a combination of socialist politics on economic issues and traditional physical force Irish republicanism. He is best remembered for the founding of the IRSP and the INLA. He was a victim of a feud with his former comrades in the Official IRA.