| Lugduff | |
| Other Name: | Log Dubh |
| Translation: | black hollow |
| Language: | Irish |
| Elevation M: | 652 |
| Elevation Ref: | [1] |
| Prominence M: | 97 |
| Listing: | Hewitt, Arderin, Simm, Vandeleur-Lynam |
| Location: | Wicklow, Ireland |
| Range: | Wicklow Mountains |
| Coordinates: | 52.9987°N -6.4037°W |
| Map: | island of Ireland |
| Map Relief: | yes |
| Topo: | OSi Discovery 56 |
| Type: | Dark blue-grey slate, phyllite & schist |
| Grid Ref Ireland: | T0722095361 |
Lugduff [2] at 652m (2,139feet), is the 154th–highest peak in Ireland on the Arderin scale,[3] and the 186th–highest peak on the Vandeleur-Lynam scale.[4] [5] Lugduff is situated in the southern sector of the Wicklow Mountains range, and forms a broad horseshoe around the Upper Lake of the Glendalough valley with the mountains of Mullacor 661m (2,169feet), Conavalla 734m (2,408feet), the hydroelectric station at Turlough Hill 681m (2,234feet), and Camaderry 699m (2,293feet).[5]
Lugduff's steep western slopes, have a distinctive "corrugated" profile, and form the deep valley sidewall of the eastern flank of Glenmalure; Lugduff's western walls also sit at the T-junction of the Fraughan Rock Glen hanging valley with the Glenmalure valley.
Just below Lugduff's summit, lies the popular 8-kilometre boarded mountain path of The Spinc White Trail around the Upper Lake of Glendalough.[6] To the south of Lugduff is the subsidiary summit of Lugduff SE Top 637m (2,090feet).[5]