Elections to Armagh District Council were held on 18 May 1977 on the same day as the other Northern Irish local government elections.

The election used four district electoral areas to elect a total of 20 councillors.

Note: "Votes" are the first preference votes.

1973: 2 x UUP, 1 x DUP, 1 x Independent 1977: 2 x UUP, 1 x DUP, 1 x SDLP 1973-1977 Change: SDLP gain from Independent 1973: 4 x UUP, 1 x DUP, 1 x SDLP 1977: 3 x UUP, 1 x DUP, 1 x SDLP, 1 x UUUP 1973-1977 Change: UUUP gain from UUP 1973: 2 x SDLP, 2 x UUP, 1 x Alliance 1977: 3 x SDLP, 2 x UUP 1973-1977 Change: SDLP gain from Alliance 1973: 3 x UUP, 2 x SDLP 1977: 2 x UUP, 2 x SDLP, 1 x Independent Nationalist 1973-1977 Change: SDLP gain from UUP, Independent Nationalist leaves SDLP