The International Celtic Congress (Breton: Ar C'hendalc'h Keltiek, Cornish: An Guntelles Keltek, Manx: Yn Cohaglym Celtiagh, Scottish Gaelic: A' Chòmhdhail Cheilteach, Irish: An Chomhdháil Cheilteach, Welsh: Y Gyngres Geltaidd) is a cultural organisation that seeks to promote the Celtic languages of Ireland, Scotland, Wales, Brittany, Cornwall and the Isle of Man.

He was motivated in part by the ideal of reviving the work of the earlier Celtic Association and its annual Pan-Celtic Congresses, but was also influenced by the social and culture aftermath of the First World War.

There had been an eleven-year gap before the August 1949 Celtic Congress at Bangor, Wales where delegates included Sir Ifor Williams and Conor Maguire, Chief Justice of Ireland.

The Celtic Congress of 1950, held at the Royal Institution of Cornwall in Truro, was a catalyst for the foundation of Mebyon Kernow the following year.

An International Celtic Congress involves lectures, visits to places of cultural and historic interest, and music and dance events.