Leenaun (Irish: An Líonán[1] or Líonán Cinn Mhara, meaning 'valley at the head of the sea'),[2] also Leenane, is a village and 1,845 acre townland in County Galway, Ireland, on the southern shore of Killary Harbour and the northern edge of Connemara.

Leenaun lies where the deep u-shaped Maam Valley, bounded by the Devilsmother to the east, and the massif of Leenaun Hill to the west, meets Killary Harbour, Ireland's deepest fjord.

On 18 July 2007, following heavy rain, the only river bridge in the village was swept away, cutting the town in half, and altering some local routes by over 100-kilometres.

[4] In the village are two pubs, a hotel with seaweed baths and two guesthouses, one of which is a former convent of the Sisters of Mercy, with a breakfast room in the former chapel.

Leenaun was the setting for the 1990 film The Field, and of Martin McDonagh's plays The Beauty Queen of Leenane and The Lonesome West.