Cullahill Mountain (Irish: Sliabh na Cúlchoille, meaning 'mountain of the hazel wood') is listed as a marilyn hill and a Special Area of Conservation in County Laois, Ireland.

[8] The location is off the M8 motorway, 15 km north-east of Urlingford and Johnstown, County Kilkenny, or south-west from Durrow along the R639 road.

Cullahill Mountain is listed as Special Area of Conservation under the European Union Habitats Directive.

[9] Amongst these grasses is mouse-ear hawkweed, wild thyme, bird's-foot-trefoil, lady's bedstraw, carline thistle, mountain everlasting, purging flax and eyebright.

[12] Passing Cummer Well and a ring fort, it tracks the low hills above the village of Cullahill.