Members of the 17th Dáil Changes Changes

| Date_ | Constituency | Gain | Loss | Note_ |
|---|---|---|---|---|
| 30 May 1963 | Dublin North–East | Fine Gael | Fine Gael | Paddy Belton (FG) holds the seat vacated by the death of his brother Jack Belton (FG) |
| 27 October 1963 | Dublin South–East | Labour Party | National Progressive Democrats | Noël Browne (NPD) disbands the National Progressive Democrats and joins the Labour Party |
| 27 October 1963 | Roscommon | Labour Party | National Progressive Democrats | Jack McQuillan (NPD) disbands the National Progressive Democrats and joins the Labour Party |
| 27 October 1963 | Dublin County | Labour Party | Independent | Seán Dunne (Ind) joins the Labour Party |