- Maastricht Summit (1991) 1
- MacGregor, John 1
- Mackay, James 1
- Maclean, Murdo 1
- Macleod, Iain 1, 2
- Macnaughton, Angus 1
- Mail on Sunday (newspaper) 1
- Major, John 1, 2, 3, 4, 5, 6, 7
- Major, Norma 1
- Malabar, HMS (shore station) 1, 2
- Malayan National Liberation Army (MNLA) 1
- Mandelson, Peter 1
- Margaret, Princess 1
- Marlow, Tony 1
- Marshall, Michael 1
- Masefield, Thorold 1
- Mather, Carol 1
- Maudling, Reggie 1, 2
- Maxwell, Robert 1
- Mayhew, Lord 1, 2, 3
- McColl, Lord Ian 1
- McNally, Lord 1
- McQuarrie, Albert 1
- Mellor, David 1, 2, 3
- Mendis, Viraj 1
- Mental Health Foundation 1
- Menuhin, Yehudi 1
- Meyer, Sir Anthony 1
- Michael of Kent, Prince 1
- Mills, Leo 1
- miners’ strikes 1, 2
- Miss Bermuda Islands contest 1
- Molloy, Bill 1
- Molotov–Ribbentrop Pact (1939) 1
- Molseed, Lesley 1
- Moors murders 1, 2
- Morris, Jan 1
- Morrison, John 1, 2, 3
- Morrison, Peter 1, 2, 3
- Morrison, Shakes 1
- mortar attack (on Downing Street) 1
- Muscroft, Colin 1
- Mussenden, Larry 1