# List of MPs for constituencies in Wales (1955–1959)

This is a list of members of Parliament (MPs) elected to the House of Commons of the United Kingdom by Welsh constituencies for the Forty-First Parliament of the United Kingdom (1955–1959).
Most MPs elected for Welsh constituencies at the 1955 United Kingdom general election, held on 26 May 1955, served a full term, but there were three by-elections.
The list is sorted by the name of the MP.

## Composition

| Affiliation | Affiliation | Members |
| | Welsh Labour Party | 27 |
| | Welsh Conservative Party | 5 |
| | Welsh Liberal Party | 3 |
| | National Liberal | 1 |
| Total | Total | 36 |

## List

| MP | Constituency | Party | In constituency since |
| Aneurin Bevan | Ebbw Vale | Labour Party | 1929 |
| Nigel Birch | West Flintshire | Conservative Party | 1950 |
| Roderic Bowen | Cardiganshire | Liberal Party | 1945 |
| James Callaghan | Cardiff South East | Labour Party | 1945 |
| William Cove | Abervaon | Labour Party | 1929 |
| Clement Davies | Montgomeryshire | Liberal Party | 1929 |
| S. O. Davies | Merthyr Tydfil | Labour Party | 1934 by-election |
| Desmond Donnelly | Pembrokeshire | Labour Party | 1950 |
| Ness Edwards | Caerphilly | Labour Party | 1939 by-election |
| Garner Evans | Denbigh | National Liberal | 1950 |
| Harold Finch | Bedwellty | Labour Party | 1950 |
| Raymond Gower | Barry | Conservative Party | 1951 |
| David Grenfell | Gower | Labour Party | 1922 |
| Jim Griffiths | Llanelli | Labour Party | 1936 by-election |
| Cledwyn Hughes | Anglesey | Labour Party | 1951 |
| Idwal Jones | Wrexham | Labour Party | 1955 |
| Thomas Jones | Merioneth | Labour Party | 1951 |
| David Llewellyn | Cardiff North | Conservative Party | 1950 |
| William Mainwaring | Rhondda East | Labour Party | 1933 by-election |
| Percy Morris | Swansea West | Labour Party | 1945 |
| Rhys Hopkin Morris | Carmarthen | Liberal Party | 1945 |
| David Mort | Swansea East | Labour Party | 1940 by-election |
| Walter Padley | Ogmore | Labour Party | 1950 |
| Arthur Pearson | Pontypridd | Labour Party | 1938 by-election |
| Arthur Probert | Aberdare | Labour Party | 1954 by-election |
| Goronwy Roberts | Caernarfon | Labour Party | 1950 |
| Peter Freeman | Newport | Labour Party | 1945 |
| George Thomas | Cardiff West | Labour Party | 1945 |
| Iorwerth Thomas | Rhondda West | Labour Party | 1950 |
| Peter Thomas | Conwy | Conservative Party | 1951 |
| Peter Thorneycroft | Monmouth | Conservative Party | 1945 by-election |
| Tudor Watkins | Brecon and Radnor | Labour Party | 1945 |
| Granville West | Pontypool | Labour Party | 1946 by-election |
| D. J. Williams | Neath | Labour Party | 1945 by-election |
| Llywelyn Williams | Abertillery | Labour Party | 1950 by-election |
| Eirene White | East Flintshire | Labour Party | 1950 |

## By-elections

There were three by-elections during this period:
| By-election | Date | Incumbent | Party | Winner | Party | Cause |
| Newport | 6 July 1956 | Peter Freeman | Labour | Frank Soskice | Labour | Death |
| Carmarthen | 28 February 1957 | Rhys Hopkin Morris | Liberal | Megan Lloyd George | Labour | Death |
| Pontypool | 10 November 1958 | Granville West | Labour | Leo Abse | Labour | Elevation to a life peerage |