| Macleod, Mary Brentford & Isleworth | C |
| MacNeil, Angus Na h-Eileanan an Iar | SNP |
| MacShane, Denis Rotherham | Lab |
| Mactaggart, Fiona Slough | Lab |
| Mahmood, Shabana Birmingham Ladywood | Lab |
| Mahmood, Khalid Birmingham Perry Barr | Lab |
| Main, Anne St Albans | C |
| Mann, John Bassetlaw | Lab |
| Marsden, Gordon Blackpool South | Lab |
| Maude, Francis Horsham | C |
| May, Theresa Maidenhead | C |
| Maynard, Paul Blackpool North & Cleveleys | C |
| McCabe, Steve Birmingham Selly Oak | Lab |
| McCann, Michael East Kilbride, Strathaven | |
| & Lesmahagow | Lab |
| McCarthy, Kerry Bristol East | Lab |
| McCartney, Jason Colne Valley | C |
| McCartney, Karl Lincoln | C |
| McClymont, Gregg Cumbernauld, Kilsyth | |
| & Kirkintilloch East | Lab |
| McCrea, Rev William Antrim South | DUP |
| McDonagh, Siobhain Mitcham & Morden | Lab |
| McDonnell, Dr Alasdair Belfast South | SDLP |
| McDonnell, John Hayes & Harlington | Lab |
| McFadden, Pat Wolverhampton South East | Lab |
| McGovern, Jim Dundee West | Lab |
| McGovern, Alison Wirral South | Lab |
| McGuinness, Martin Ulster Mid | SF |
| McGuire, Anne Stirling | Lab |
| McIntosh, Anne Thirsk & Malton | C |
| McKechin, Ann Glasgow North | Lab |
| McKinnell, Catherine Newcastle upon Tyne North | Lab |
| McLoughlin, Patrick Derbyshire Dales | C |
| McPartland, Stephen Stevenage | C |
| McVey, Esther Wirral West | C |
| Meacher, Michael Oldham West & Royton | Lab |
| Meale, Joseph Mansfield | Lab |
| Mearns, Ian Gateshead | Lab |
| Menzies, Mark Fylde | C |
| Mercer, Patrick Newark | C |
| Metcalfe, Stephen Basildon South & Thurrock East | C |
| Michael, Alun Cardiff South & Penarth | Lab |
| Miliband, Ed Doncaster North | Lab |
| Miliband, David South Shields | Lab |
| Miller, Maria Basingstoke | C |
| Miller, Andrew Ellesmere Port & Neston | Lab |
| Mills, Nigel Amber Valley | C |
| Milton, Anne Guildford | C |
| Mitchell, Austin Great Grimsby | Lab |
| Mitchell, Andrew Sutton Coldfield | C |
| Moon, Madeleine Bridgend | Lab |
| Moore, Michael Berwickshire, Roxburgh & Selkirk | LD |
| Mordaunt, Penny Portsmouth North | C |
| Morden, Jessica Newport East | Lab |
| Morgan, Nicky Loughborough | C |
| Morrice, Graeme Livingston | Lab |
| Morris, Grahame Easington | Lab |
| Morris, James Halesowen & Rowley Regis | C |
| Morris, David Morecambe & Lunesdale | C |
| Morris, Anne-Marie Newton Abbot | C |
| Mosley, Stephen City of Chester | C |
| Mowat, David Warrington South | C |
| Mudie, George Leeds East | Lab |
| Mulholland, Greg Leeds North West | LD |
| Mundell, David Dumfriesshire, Clydesdale | |
| & Tweeddale | C |
| Munn, Meg Sheffield Heeley | Lab |
| Munt, Tessa WellsL | D |
| Murphy, Conor Newry & Armagh | SF |
| Murphy, Jim Renfrewshire East | Lab |
| Murphy, Paul Torfaen | Lab |
| Murray, Sheryll Cornwall South East | C |
| Murray, Ian Edinburgh South | Lab |
| Murrison, Andrew Wiltshire South West | C |
