The IMC was founded in 1942 by Bill Perrott and a group of other climbers in south Dublin, within easy reach of Dalkey Quarry. They established several climbs in Dalkey and at other locations around Dublin such as The Scalp, Bray Head, and Ireland’s Eye; these were the first steps in the development of climbing in Ireland. This group, now known as “The Old IMC”, disbanded in 1944.

In 1948, the IMC was revived on a more formal basis by Perrott, Joss Lynam, and others, with the intention that it become a national club drawing its membership from all around Ireland, with local branches in the major cities. The first President was the renowned naturalist Robert Lloyd Praeger.

During the 1950s the IMC became the dominant force in Irish mountaineering, and branches were established in Dublin and Belfast, and one for the “Wild Geese”, Irish emigrants living abroad. In 1957, with the aid of a grant from the Guinness brewing company, the club purchased a farmhouse at Glendasan, near Glendalough, County Wicklow, and converted it into a mountain hut, to be run by the Dublin section. Later another hut (called the “Bloat House”) was established in the Annalong valley in the Mourne Mountains in County Down; this was to be run by the Belfast section.

The increasing affluence of the 1960s saw the emergence of other mountaineering clubs in Ireland, and the IMC’s dominance began to weaken. In 1971 the Federation of Mountaineering Clubs in Ireland (FMCI, later the MCI, now Mountaineering Ireland) was formed, which ended the IMC’s national aspirations. In the meantime, the club became increasingly Dublin-based, and the struggling Belfast section was finally dissolved in 1991, two years after the Bloat House burnt down resulting in several serious injuries.

The club now draws its membership almost exclusively from the Dublin area.

The above text is being used as an interim measure until such time as a someone contributes a more extensive history; it was copied from the relevant Wikipedia article on 10 October 2019, and is available under the Creative Commons Attribution-ShareAlike License.