Mackworth Castle
Malmesbury Castle
Malpas Castle
Mansel Lacy Moat
Manorbier Castle
Marisco Castle
Markenfield Hall
Marlborough Castle
Marmion Tower
Mathrafal Castle
Maxstoke Castle
Melandra (Ardotalia) Fort
Melbourne Castle
Melling Motte
Meppershall Castle
Merdon Castle
Mere Castle
Middleham Castle
Middleton Hall
Middleton Stoney Castle
Mileham Castle
Millom Castle
Mettingham Castle
Midhurst Castle
Minster Lovell Hall
Mitford Castle
Mold Castle
Monmouth Castle
Mont Orgeil Castle (CI)
Montgomery Castle
More Castle
Morgraig Castle
Morlais Castle
Moreton Corbet Castle
Morpeth Castle
Mount Bures
Mountsorrel Castle
Mouselow Castle
Mowbray Castle
Much Marcle Castle
Mulgrave Castle
Muncaster Castle
Myddle Castle
Mynydd-brydd Tumps
