The Gurdjieff Foundation is a variety of organisations based on the ideas of George Gurdjieff.
Gurdjieff inspired the formation of many groups after his death. Of these the largest, the Gurdjieff Foundation, was organized and led by Jeanne de Salzmann from the early 1950s, in cooperation with other direct pupils, until her death in 1990; and until his death in 2001 by Michel de Salzmann.
The International Association of the Gurdjieff Foundations  is an umbrella group for the four main organisations: The Gurdjieff Foundation in the USA, The Gurdjieff Society in the UK, the Institut Gurdjieff in France and GI Gurdjieff Foundation - Caracas in Venezuela. There is a network of partner foundations in South America.
The president of the Gurdjieff Foundation of New York was Henry John Sinclair, 2nd Baron Pentland, Lord Pentland from its formation until his death in 1984. It was then led by Dr. William J. Welch until his death in 1999, after which it was led jointly by Paul Reynard, a painter and teacher of Gurdjieff Movements, and Frank R. Sinclair, author of Without Benefit of Clergy and Of the Life Aligned, until Reynard's death in 2005. Frank R. Sinclair continued as president until 2011 and is currently president-emeritus.