Montgomeryshire () is an inland traditional county of Wales also known as Maldwyn. The borders of Montgomeryshire correspond roughly to the medieval kingdom of Powys Wenwynwyn. It is also the birth place of Saint Richard Gwyn.

The county is bounded to the north by Denbighshire, to the east and southeast by Shropshire, to the south by Radnorshire, to the southwest by Cardiganshire and to the west and northwest by Merionethshire. It was formed under the terms of the Statute of Rhuddlan in 1284 from the ashes of the medieval kingdom of Powys Wenwynwyn. Its cantrefi included:

• Cyfeiliog
• Arwystli
• Mawddwy
• Mochnant
• Deuddwy
• Ystrad Marchell
• Gorddwr

It also included the Lordships of Cydewain and Mechain

The area is almost wholly mountainous, although there are some fertile valleys on the Shropshire side. The highest point is Mole Sych at 2,712 ft (827 m). Its main rivers are the River Severn and the River Dyfi. Lake Vyrnwy is a reservoir supplying Liverpool.

The main towns are Llanfyllin, Machynlleth, Montgomery, Newtown and Welshpool. The main industries are agriculture (mainly hill farming) and tourism.

Places of special interest:

• Bryn Tail Lead Mine Buildings
• Centre for Alternative Technology
• Dolforwyn Castle
• Montgomery Castle
• Powis Castle, Welshpool
• Trefeglwys Tumuli
• Mathrafal
• Meifod

Traditional counties of Wales | Montgomeryshire

Sir Drefaldwyn | Sir Drefaldwyn | Montgomeryshire