Keadeen Mountain (Irish: Céidín, meaning 'flat-topped hill') at 653 metres (2,142 ft), is the 152nd–highest peak in Ireland on the Arderin scale, and the 184th–highest peak on the Vandeleur-Lynam scale. Keadeen is situated at the far southwestern end of the Wicklow Mountains range, separated from the large massif of Lugnaquilla on its own small isolated massif with Carrig Mountain 571 metres (1,873 ft); it overlooks the Glen of Imaal from the south.

According to Irish academic Paul Tempan, "Keadeen" is also the name of a townland in the nearby parish of Kilranelagh. In Irish the peak was sometimes called Céidín Uí Mháil in full, which was a name derived from the native group who gave their name to the nearby Glen of Imaal.

Dwyer–McAllister Cottage is at the northern base of Keadeen at Derrynamuck, where Michael Dwyer, the 1798 rebellion United Irishmen leader, escaped from the British soldier's siege on Sam McAllister cottage in December 1799 up the slopes of the mountain.

• MountainViews Online Database (Simon Stewart) (2013). A Guide to Ireland's Mountain Summits: The Vandeleur-Lynams & the Arderins. Collins Books. ISBN 978-1-84889-164-7.
• Dillion, Paddy (1993). The Mountains of Ireland: A Guide to Walking the Summits. Cicerone. ISBN 978-1852841102.

• Wicklow Way
• Wicklow Mountains
• Lists of mountains in Ireland
• List of mountains of the British Isles by height
• List of Marilyns in the British Isles
• List of Hewitt mountains in England, Wales and Ireland

• MountainViews: The Irish Mountain Website, Keadeen Mountain
• MountainViews: Irish Online Mountain Database
• The Database of British and Irish Hills , the largest database of British Isles mountains ("DoBIH")
• Hill Bagging UK & Ireland, the searchable interface for the DoBIH