Cloghernagh, Mountain summit in County Wicklow, Ireland.

Cloghernagh is a mountain in County Wicklow reaching 800 metres, the fourth-highest summit in the Wicklow Mountains. Its northern side forms the steep southern walls and cliffs of the U-shaped hanging valley of Fraughan Rock Glen, which falls into the Glenmalure valley below.

Cloghernagh lies in the southern Wicklow Mountains as part of the Lugnaquilla massif, whose 925-metre summit is Wicklow's highest. Its northern face forms the steep cliffs of the hanging valley Fraughan Rock Glen, which drops into Glenmalure. The mountain also wraps around the Carrawaystick River glen with Corrigasleggaun and Kelly's Lough.

The name comes from Irish and means 'stony place,' reflecting the rocky character of the mountain. Visitors can observe these stone formations scattered across the slopes throughout their visit.

Cloghernagh sits in the southern Wicklow Mountains within the Lugnaquilla massif, so approaches come from Glenmalure and the Fraughan Rock Glen side. Its northern face forms the steep cliffs above that hanging valley, and Arts Lough lies high on the north-eastern flank. Allow a full day and expect wet, trackless ground.

Arts Lough, a high corrie lake at 511 metres, sits high on Cloghernagh's north-eastern flank. The peak's northern side forms the steep southern walls of the U-shaped hanging valley of Fraughan Rock Glen, which drops into Glenmalure below.