Arderin () is a mountain on the border between counties Laois and Offaly in Ireland. With a height of 527 metres (1,729 ft) it is the highest point in the Slieve Bloom Mountains, and is the highest point in both counties.
An Arderin is also a descriptive word for a specific category of Irish mountains in the series of lists maintained by Irish mountain database, MountainViews; those over 500m with a prominence of at least 30m. This list, along with other complementary ones, has been published in book form by Collins Press.Mountainviews, (2013), "A Guide to Ireland's Mountain Summits: The Vandeleur-Lynams & the Arderins", Collins Books, Cork, Mountainviews.ie classifies a mountain as being above 500m, but also maintains a number of lists of hills below this threshold.
See also Lists of mountains in Ireland List of Irish counties by highest point List of mountains of the British Isles by height List of Marilyns in the British Isles
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