Place
- Manorbier, Pembrokeshire1
- Mawgan in Meneage, Cornwall1
- Merivale, Devon1
- Midmar, Aberdeenshire1
- Minster in Thanet, Kent1
- Minster, Cornwall1
- Monasterboice, Louth1
- Monkwearmouth, Durham1
- Monmouthshire, England1
- Morbihan, Brittany1
- Morvah, Cornwall1
- Morvill, Shropshire1
- Mount, Cardiganshire1
- Nevern, Pembrokeshire1
- New Grange, counties Meath and Louth1
- New Moat, Pembrokeshire1
- Newborough, Anglesey1
- Newport, Monmouthshire1
- Newport, Pembrokeshire1
- Newton-Ards, Down1