Monmouth Cap is a hamlet in the north of the county of Monmouthshire, Wales.

The hamlet is located in the very north of the county of Monmouthshire, on the border with Herefordshire.

[1] It stands on the minor road from Llangua to Grosmont, east of the A465.

[3] The hamlet contains a number of listed buildings, centred on Monmouth Cap Farm.

[4][5][6] The Royal Commission on the Ancient and Historical Monuments of Wales (RCAHMW) identifies the barn as a corn store, of 18th-century date.