Members By family name - M
- MacAlister, Josh
- MacAskill, Kenny
- MacCleary, James
- Macdonald, Alice
- MacDonald, Angus
- MacKinlay, Craig
- Mackintosh, David
- Mackrory, Cherilyn
- Maclean, Rachel
- MacLeod, Mary
- MacNae, Andy
- MacNeil, Angus
- Macshane, Denis
- Mactaggart, Fiona
- Madders, Justin
- Maguire, Ben
- Maguire, Helen
- Mahmood, Khalid
- Mahmood, Shabana
- Main, Anne
- Mak, Alan
- Malhotra, Seema
- Mallaghan, Cathal
- Malthouse, Kit
- Mangnall, Anthony
- Mann, John
- Mann, Scott
- Marris, Rob
- Marsden, Gordon
- Marson, Julie
- Martin, Amanda
- Martin, Mike
- Martin, Sandy
- Maskell, Rachael
- Maskey, Paul
- Masterton, Paul
- Mather, Keir
- Matheson, Chris
- Mathew, Brian
- Mathias, Tania
- Maude, Francis
- May, Theresa
- Mayer, Alex
- Mayhew, Jerome
- Maynard, Charles
- Maynard, Paul
- McAllister, Douglas
- McCabe, Stephen
- McCaig, Callum
- McCallion, Elisha
- McCann, Michael
- McCarthy, Kerry
- McCartney, Jason
- McCartney, Karl
- McCluskey, Martin
- McClymont, Gregg
- McCrea, William
- McDonagh, Siobhain
- McDonald, Andy
- McDonald, Chris
- McDonald, Stewart
- McDonald, Stuart
- McDonnell, Alasdair
- McDonnell, John
- McDougall, Blair
- McElduff, Barry
- McEvoy, Lola
- McFadden, Pat
- McGarry, Natalie
- McGinn, Conor
- McGovern, Alison
- McGovern, Jim
- McGuinness, Martin
- McGuire, Anne
- McInnes, Liz
- McIntosh, Anne
- McIntyre, Alex
- McKechin, Ann
- McKee, Gordon
- McKenna, Kevin
- McKinnell, Catherine
- McLaughlin, Anne
- McLoughlin, Patrick
- McMahon, Jim
- McMorrin, Anna
- McMurdock, James
- McNally, Frank
- McNally, John
- McNeill, Kirsty
- McPartland, Stephen
- McVey, Esther
- Meacher, Michael
- Meale, Alan
- Mearns, Ian
- Medi, Llinos
- Menzies, Mark
- Mercer, Johnny
- Mercer, Patrick
- Merriman, Huw
- Metcalfe, Stephen
- Michael, Alun
- Midgley, Anneliese
- Miliband, David
- Miliband, Edward
- Millar, Robin
- Miller, Andrew
- Miller, Calum
- Miller, Maria
- Milling, Amanda
- Mills, Nigel
- Milne, John
- Milton, Anne
- Minns, Julie
- Mishra, Navendu
- Mitchell, Andrew
- Mitchell, Austin
- Mohamed, Abtisam
- Mohamed, Iqbal
- Mohindra, Gagan
- Molloy, Francie
- Monaghan, Carol
- Monaghan, Paul
- Moon, Madeleine
- Moon, Perran
- Moore, Damien
- Moore, Michael
- Moore, Robbie
- Moran, Layla
- Mordaunt, Penny
- Morden, Jessica
- Morello, Edward
- Morgan, Helen
- Morgan, Nicky
- Morgan, Stephen
- Morrice, Graeme
- Morris, Anne Marie
- Morris, David
- Morris, Grahame
- Morris, James
- Morris, Joe
- Morrison, Tom
- Morrissey, Joy
- Morton, Wendy
- Mosley, Stephen
- Mowat, David
- Mudie, George
- Mulholland, Greg
- Mullan, Kieran
- Mullane, Margaret
- Mullin, Roger
- Mumby-Croft, Holly
- Mundell, David
- Munn, Meg
- Munt, Tessa
- Murphy, Conor
- Murphy, Jim
- Murphy, Luke
- Murphy, Paul
- Murray, Chris
- Murray, Ian
- Murray, James
- Murray, Katrina
- Murray, Sheryll
- Murray, Susan
- Murrison, Andrew
- Myer, Luke