The following table shows the composition by party when the 17th Seanad first met on 23 February 1983.
| Name | Panel | | Party | Notes |
|---|
| Belton, Luke Luke Belton | Administrative Panel | | Fine Gael | |
| Bulbulia, Katharine Katharine Bulbulia | Administrative Panel | | Fine Gael | |
| Honan, Tras Tras Honan | Administrative Panel | | Fianna Fáil | Elected as Leas-Cathaoirleach on 9 March 1983[1] |
| Kennedy, Patrick Patrick Kennedy | Administrative Panel | | Fine Gael | |
| Lynch, Michael Michael Lynch | Administrative Panel | | Fianna Fáil | Elected to the 25th Dáil at the general election on 17 February 1987[2] |
| O'Donoghue, Martin Martin O'Donoghue | Administrative Panel | | Fianna Fáil | |
| O'Mahony, Flor Flor O'Mahony | Administrative Panel | | Labour Party | |
| Burke, Ulick Ulick Burke | Agricultural Panel | | Fine Gael | |
| Ellis, John John Ellis | Agricultural Panel | | Fianna Fáil | Elected to the 25th Dáil at the general election on 17 February 1987[2] |
| Ferris, Michael Michael Ferris | Agricultural Panel | | Labour Party | |
| Hourigan, Richard Richard Hourigan | Agricultural Panel | | Fine Gael | |
| Hussey, Thomas Thomas Hussey | Agricultural Panel | | Fianna Fáil | |
| Kiely, Rory Rory Kiely | Agricultural Panel | | Fianna Fáil | |
| Lennon, Joseph Joseph Lennon | Agricultural Panel | | Fine Gael | |
| McDonald, Charles Charles McDonald | Agricultural Panel | | Fine Gael | |
| O'Toole, Martin Martin O'Toole | Agricultural Panel | | Fianna Fáil | |
| Quealy, Michael Michael Quealy | Agricultural Panel | | Fine Gael | |
| Ryan, William William Ryan | Agricultural Panel | | Fianna Fáil | |
| de Brún, Séamus Séamus de Brún | Cultural and Educational Panel | | Fianna Fáil | |
| Fleming, Brian Brian Fleming | Cultural and Educational Panel | | Fine Gael | |
| Loughrey, Joachim Joachim Loughrey | Cultural and Educational Panel | | Fine Gael | |
| McAuliffe-Ennis, Helena Helena McAuliffe-Ennis | Cultural and Educational Panel | | Labour Party | Joined the Progressive Democrats in 1986[3] |
| Smith, Michael Michael Smith | Cultural and Educational Panel | | Fianna Fáil | Elected to the 25th Dáil at the general election on 17 February 1987[2] |
| Conway, Timmy Timmy Conway | Industrial and Commercial Panel | | Labour Party | Joined the Progressive Democrats in 1986 |
| Daly, Jack Jack Daly | Industrial and Commercial Panel | | Fine Gael | |
| Fallon, Seán Seán Fallon | Industrial and Commercial Panel | | Fianna Fáil | |
| FitzGerald, Alexis Jnr Alexis FitzGerald, Jnr | Industrial and Commercial Panel | | Fine Gael | |
| Fitzsimons, Jack Jack Fitzsimons | Industrial and Commercial Panel | | Fianna Fáil | |
| Howard, Michael Michael Howard | Industrial and Commercial Panel | | Fine Gael | |
| Lanigan, Mick Mick Lanigan | Industrial and Commercial Panel | | Fianna Fáil | |
| Reynolds, Patrick J. Patrick J. Reynolds | Industrial and Commercial Panel | | Fine Gael | Elected as Cathaoirleach on 23 February 1983[4] |
| Ryan, Eoin Snr Eoin Ryan, Snr | Industrial and Commercial Panel | | Fianna Fáil | |
| Cassidy, Donie Donie Cassidy | Labour Panel | | Fianna Fáil | |
| Cregan, Denis Denis Cregan | Labour Panel | | Fine Gael | |
| Hanafin, Des Des Hanafin | Labour Panel | | Fianna Fáil | |
| Harte, Jack Jack Harte | Labour Panel | | Labour Party | |
| Higgins, Jim Jim Higgins | Labour Panel | | Fine Gael | Elected to the 25th Dáil at the general election on 17 February 1987[2] |
| Hillery, Brian Brian Hillery | Labour Panel | | Fianna Fáil | |
| Kelleher, Peter Peter Kelleher | Labour Panel | | Fine Gael | |
| Killilea, Mark Jnr Mark Killilea, Jnr | Labour Panel | | Fianna Fáil | |
| McMahon, Larry Larry McMahon | Labour Panel | | Fine Gael | |
| Mullooly, Brian Brian Mullooly | Labour Panel | | Fianna Fáil | |
| O'Brien, Andy Andy O'Brien | Labour Panel | | Fine Gael | |
| Dooge, James James Dooge | National University of Ireland | | Fine Gael | Leader of the Seanad |
| Higgins, Michael D. Michael D. Higgins | National University of Ireland | | Labour Party | Elected to the 25th Dáil at the general election on 17 February 1987[2] |
| Ryan, Brendan Brendan Ryan | National University of Ireland | | Independent | |
| McGuinness, Catherine Catherine McGuinness | University of Dublin | | Independent | |
| Robinson, Mary Mary Robinson | University of Dublin | | Independent | |
| Ross, Shane Shane Ross | University of Dublin | | Independent | |
| Browne, John John Browne | Nominated by the Taoiseach | | Fine Gael | |
| Connor, John John Connor | Nominated by the Taoiseach | | Fine Gael | |
| Deenihan, Jimmy Jimmy Deenihan | Nominated by the Taoiseach | | Fine Gael | Elected to the 25th Dáil at the general election on 17 February 1987[5] |
| Durcan, Patrick Patrick Durcan | Nominated by the Taoiseach | | Fine Gael | |
| Howlin, Brendan Brendan Howlin | Nominated by the Taoiseach | | Labour Party | Elected to the 25th Dáil at the general election on 17 February 1987[6] |
| Kirwan, Christy Christy Kirwan | Nominated by the Taoiseach | | Labour Party | |
| Magner, Pat Pat Magner | Nominated by the Taoiseach | | Labour Party | |
| McGonagle, Stephen Stephen McGonagle | Nominated by the Taoiseach | | Independent | |
| O'Leary, Seán Seán O'Leary | Nominated by the Taoiseach | | Fine Gael | |
| Robb, John John Robb | Nominated by the Taoiseach | | Independent | |
| Rodgers, Bríd Bríd Rodgers | Nominated by the Taoiseach | | Independent | |
| Fennell, Nuala Nuala Fennell | Nominated by the Taoiseach | | Fine Gael | Nominated 20 February 1987 to fill vacancy after the general election[7] |
| O'Toole, Paddy Paddy O'Toole | Nominated by the Taoiseach | | Fine Gael | Nominated 20 February 1987 to fill vacancy after the general election[7] |