The Glen of Imaal is a remote glen in the western Wicklow Mountains in Ireland. It is ringed by the Lugnaquilla massif and its foothills, including Table Mountain and Keadeen. Much of the glen is used by the Irish Army as an artillery firing range, and hill walkers who use the glen are advised to observe the times of firing practice and to refrain from picking up strange objects.

A glen is a valley, typically one that is long and bounded by gently sloped concave sides, unlike a ravine, which is deep and bounded by steep slopes. The word is Goidelic in origin: gleann in Irish and Scottish Gaelic, glion in Manx. The designation "glen" also occurs often in place names. Glens are appreciated by tourists for their tranquility and scenery.