Lampeter Castle, Ceredigion Landimore Castle, Swansea
Laugharne Castle, Carmarthenshire
Liege Castle, Vale of Glamorgan
Llanblethian Castle, South Glamorgan
Llanafan Fawr Castle, Powys
Llandaff Castle, Cardiff
Llandeilo Talybont, Swansea
Llandovery Castle, Carmarthenshire
Llanfair Kilgeddin Castle, Monmouthshire
Llangadog Castle, Carmarthenshire
Llangathen Castle, Carmarthenshire
Llangibby Castle, Monmouthshire
Llangynwyd Castle, Bridgend
Llanhilleth Castle, Blaenau Gwent
Llanidloes Castle, Powys
Llanilid Castle, Glamorgan
Llanquian Castle, Vale of Glamorgan
Llanrhystyd Castle, Ceredigion
Llansteffan Castle, Carmarthenshire
Llantrisant Castle, Glamorgan
Llanvair Castle, Monmouthshire
Llawhaden Castle, Pembrokeshire
Loughor Castle, Swansea
Castell Machen, Caerphilly Council
Castle Madoc, Powys
Castell Mael, Pembrokeshire
Manorbier Castle, Pembrokeshire
Manorowen Castle, Pembrokeshire
Mathrafal Castle, Powys
Castell Moel, Carmarthenshire
Moel Froehas Castle, Powys
Mold Castle, Flintshire
Monmouth Castle, Monmouthshire
Monnow Bridge and Gate, Monmouthshire
Montgomery Castle, Powys
Montgomeryshire Mottes
Castell Morgraig, Cardiff
Morlais Castle, Mid Glamorgan
Castle Morris, Pembrokeshire