Mullacor, Mountain summit in County Wicklow, Ireland.

Mullacor is a 661-metre summit in the southern Wicklow Mountains, the 141st-highest peak in Ireland on the Arderin scale. Its western flank forms the stepped sides of Glenmalure, and it stands in a broad horseshoe around the Upper Lake of Glendalough with Lugduff, Conavalla, Turlough Hill and Camaderry. Cullentragh Mountain lies to its east.

Mullacor is the 141st-highest peak in Ireland on the Arderin scale and the 172nd on the Vandeleur-Lynam scale. It forms a broad horseshoe around the Upper Lake of Glendalough with Lugduff, Conavalla, Turlough Hill and Camaderry. Its western flank forms the step sides of Glenmalure, and to its east lies Cullentragh Mountain.

Mullacor's Irish name, Mullaigh Mhór, means 'big hilltop'. It is the 141st-highest peak in Ireland on the Arderin scale and the 172nd on the Vandeleur-Lynam scale, and its 102-metre prominence ranks it 90th on the MountainViews list of the 100 Highest Irish Mountains.

Mullacor lies in the southern Wicklow Mountains, with its western flank dropping into Glenmalure and Cullentragh Mountain 510 m to the east. Approach from the Glendalough side, where the horseshoe around the Upper Lake links it with Lugduff, Conavalla, Turlough Hill and Camaderry. Its 102 m prominence means the ridge is broad and the ground peaty; expect wet bog underfoot after rain.

Mullacor ranks as the 141st-highest peak in Ireland on the Arderin scale and 172nd on the Vandeleur-Lynam scale. Its prominence of 102 metres falls short of Marilyn status but places it 90th on the MountainViews list of Ireland's 100 highest mountains, where the threshold is 100 metres.