Arderin

{{about|the mountain in Ireland|the mountain classification|Lists of mountains in Ireland#Arderins}}

{{short description|Mountain in Laois/Offaly, Ireland}}

{{Use dmy dates|date=May 2020}}

{{Use Irish English|date=May 2020}}

{{Infobox mountain

| name = Arderin

| native_name = {{Native name|ga|Ard Éireann|paren=omit}}

| photo = The Fanning Pass - geograph.org.uk - 586980.jpg

| photo_caption = Arderin from the Glendine Gap

| elevation_m = 527

| elevation_ref =

| prominence_m = 420

| prominence_ref=

| listing = County Top (Laois and Offaly), Marilyn

| range = Slieve Bloom Mountains

| location = Counties Laois & Offaly, Ireland

| translation = Ireland's Height

| language = Irish

| map = Ireland | region =

| coordinates = {{coord|53|02|17|N|7|39|14|W|type:mountain_scale:100000|format=dms|display=inline,title}}

| coordinates_ref =

| topo = OSi Discovery 54

| grid_ref_Ireland = S232989

| type =

| age =

| first_ascent =

| easiest_route =

}}

Arderin ({{irish place name|Ard Éireann|Ireland's height}}) 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.{{cite web | url = http://mountainviews.ie/mv/index.php?ids=summit_view&mtnindex=399| title = Arderin | publisher = MountainViews | access-date = 2 June 2019}}

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, {{ISBN|978-1-84889-164-7}} Mountainviews.ie classifies a mountain as being above 500m, but also maintains a number of lists of hills below this threshold.