Mumbles Hill is a hill near the south eastern tip of the Gower Peninsula, Wales. Parts of the hill form a designated Local Nature Reserve, declared in 1991.

Defensive gunnery positions were built on the hill in World War II. Remnants of the 623rd Anti-Aircraft Battery gun emplacements and control bunker are still visible on the hill.

Coastal Defence Battery 299 had a site on a hill with 6 inch gun and underground magazines, though none of this remains on the hill. However there are information boards marking the spot.

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51°34′08″N 3°59′07″W / 51.5688°N 3.9852°W / 51.5688; -3.9852