| Mackney |  | Hamlet in the parish of Brightwell |
| Maidenhead | Â | Market town and municipal borough in the parishes of Bray and Cookham |
| Marcham | Â | Parish in the hundred of Ock |
| Market Ilsley | Â | Alternative name for East Ilsley, a parish and market town in the hundred of Compton |
| Marlstone | Â | Tything and chapelry in the parish of Bucklebury |
| Marsh Benham | Â | Tything in the parish of Speen |
| Mayles | Â | Hamlet in the parish of Sulhampstead Bannister |
| Midgham | Â | Tything in the parish of Thatcham |
| Milton | Â | Parish in the hundred of Ock |
| Milton Heights | Â | Part of Milton |
| Monkey Island | Â | Islet in the Thames in the parish of Bray |
| Moreton | Â | One of the 20 hundreds of Berkshire, containing the parishes of Ashampstead, Aston Tirrold, Basildon, Brightwell, Dudcott, East Garston, Hagbourne, Harwell, North Moreton, South Moreton, Moulsford, Sotwell, Streatley, and parts of Allhallows and Blewberry |
| Moreton, North | Â | see North Moreton, a parish in the hundred of Moreton |
| Moreton, South | Â | see South Moreton, a parish in the hundred of Moreton |
| Mortimer, West-end and Mortimer | Â | Tything in the parish of Stratfield Mortimer |
| Moulsford | Â | Parish in the hundred of Moreton |
|  Mount, The |  | see The Mount |
