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Llanelly (Welsh: Llanelli) is the name of both a parish and community in Monmouthshire principal area, within the historic boundaries of Brecknockshire, south-east Wales. It roughly covers the area of the Clydach Gorge.
Llannelly Hill occupies the northwest hilltop of the Clydach Gorge. It developed as a result of coal mining and limestone quarrying for the nearby ironwworks including Clydach ironworks and Ebbw Vale ironworks.
Clydach South developed on the south side of the river above the ironworks climbing the northwest slopes towards Llanelly Hill.
Maesygwartha lies between Clydach and Gilwern along one of the many tramroads in the gorge.
The parish is part of the principal area of Monmouthshire, but before local government reorganisation in 1996, it was in the district of Blaenau Gwent, but the electors overwhelmingly voted to be transferred out.