| Name | Post held |
| John A. Costello | Taoiseach |
| William Norton | Tánaiste and Minister for Industry & Commerce |
| Richard Mulcahy | Minister for Education and Minister for the Gaeltacht (from 2.7.56 to 24.10.56) |
| Joseph Blowick | Minister for Lands |
| James Everett | Minister for Justice |
| James M. Dillon | Minister for Agriculture |
| Sean MacEoin | Minister for Defence |
| Michael Keyes | Minister for Posts and Telegraphs |
| Liam Cosgrave | Minister for External Affairs |
| Brendan Corish | Minister for Social Welfare |
| Gerard Sweetman | Minister for Finance |
| Patrick O'Donnell | Minister for Local Government |
| Thomas F. O'Higgins | Minister for Health |
| Patrick James Lindsay | Minister for the Gaeltacht (from: 24.10.1956) |
(Inter-party Government comprising of Fine Gael, Labour, Clann na Talmhúain & Clann na Pobhlachta.
Under the Ministers and Secretaries Act, the Government can create new Departments and assign Ministers to them. The Seventh Government created a new Department of the Gaeltacht.
| Name | Post held |
| John O'Donovan | Parl. Sec. to the Government |
| Denis J. O'Sullivan | Parl. Sec. to the Taoiseach and Parl. Sec. to Minister for Defence |
| Michael Donnellan | Parl. Sec. to Minister for Finance |
| William Davin | Parl. Sec. to Minister for Local Government (to: 1.3.1956 - died) |
| Oliver J. Flanagan | Parl. Sec. to Minister for Agriculture |
| Patrick J. Crotty | Parl. Sec. to Minister for Industry and Commerce |
| Daniel Spring | Parl. Sec. to Minister for Local Government (from: 16.3.1956) |
| Patrick J. Lindsay | Parl. Sec. to Minister for the Gaeltacht, * Parl. Sec. to Minister for Education, (both positions until 24.10.1956 - appointed as Minister for the Gaeltacht) |
Inter-party Government comprising of Fine Gael, Labour, Clann na Talmhúain & Clann na Pobhlachta.
