Castlereagh Area A was one of the three district electoral areas in Castlereagh, Northern Ireland which existed from 1973 to 1985.
The district elected six members to Castlereagh Borough Council, and formed part of the Belfast South constituencies for the Northern Ireland Assembly and UK Parliament.
It was created for the 1973 local elections, and contained the wards of Beechill, Carryduff, Four Winds, Minnowburn, Moneyreagh and Newtownbreda.
It was abolished for the 1985 local elections and replaced by the Castlereagh South DEA.
1977: 2 x Alliance, 2 x UUP, 1 x DUP, 1 x Independent Unionist 1981: 2 x DUP, 2 x UUP, 1 x Alliance, 1 x Independent Unionist 1977-1981 Change: DUP gain from Alliance 1973: 3 x UUP, 2 x Alliance, 1 x United Loyalist 1977: 2 x Alliance, 2 x UUP, 1 x DUP, 1 x Independent Unionist 1973-1977 Change: DUP and Independent Unionist gain from UUP and United Loyalist 1973: 3 x UUP, 2 x Alliance, 1 x United Loyalist