World Monuments Fund (WMF) is a private, international, non-profit organization dedicated to the preservation of historic architecture and cultural heritage sites around the world through fieldwork, advocacy, grantmaking, education, and training.

Founded in 1965, WMF is headquartered in New York, and has offices and affiliates around the world, including Cambodia, France, Peru, Portugal, Spain, and the United Kingdom. In addition to hands-on management, the affiliates identify, develop, and manage projects, negotiate local partnerships, and attract local support to complement funds provided by donors.

The International Fund for Monuments (IFM) was an organization created by Colonel James A. Gray (1909–1994) after his retirement from the U.S. Army in 1960. Gray had conceived of a visionary project to arrest the settlement of the Leaning Tower of Pisa by freezing the soil underneath, and he formed the organization in 1965 as a vehicle for the implementation of this idea. Even though this project did not materialize, an opportunity arose for the young organization to participate in the conservation of the rock-hewn churches of Lalibela in Ethiopia. In 1966 Gray secured the support of philanthropist Lila Acheson Wallace (1889–1984), who offered $150,000 to the International Fund for Monuments and UNESCO (the United Nations Educational, Scientific and Cultural Organization) for this project. The project continued until the Communist overthrow of Haile Selassie I and the subsequent expulsion of foreigners from Ethiopia. After Ethiopia, Gray's interests shifted to Easter Island (Rapa Nui) off the coast of Chile. Gray formed the "Easter Island Committee", with Norwegian ethnographer and adventurer Thor Heyerdahl (1914–2002) as its honorary chairman. Gray arranged to have one of the monolithic human figures known as moai exhibited in the United States. With the help of anthropologist William Mulloy (1917–1978), Gray selected an 8-foot-tall (2.4 m), five-ton head, which was exhibited in front of the Seagram Building in New York and in the Pan American Union Building in Washington, D.C.

An important chapter for the organization started with its involvement in the broad international effort led by UNESCO for the protection of the city of Venice, Italy from catastrophic flooding. After the extremely high tide of 4 November 1966, the city, including the historic Piazza San Marco, was inundated for more than 24 hours. The International Fund for Monuments set up a "Venice Committee", with Professor John McAndrew (1904–1978) of Wellesley College as chairman and Gray as executive secretary. On the part of the committee, appeals were made to the American public, and local chapters set up in American cities. This early initiative led to the formation of the independent organization Save Venice in 1971. These efforts helped establish a reputation for IFM. In Spain, the organization formed a Committee for Spain under the leadership of American diplomat and U.S. Ambassador to Spain in 1965–67 Angier Biddle Duke (1915–1995).

At the invitation of UNESCO in the 1970s, IFM became involved in architectural conservation in Nepal, where the organization adopted the Mahadev temple complex in Gokarna, in Nepal's Kathmandu Valley. The 14th-century temple building was surveyed, rotten timbers were replaced, and the foundations were strengthened. Sculpted wooden architectural elements were painstakingly cleaned of layers of a motor oil coating that had been applied annually for protection.

Also at the request of UNESCO, IFM launched a project for the preservation of the Citadelle Laferrière, a large mountaintop fortress near Milot, Haiti. The site was the keystone of a defensive system constructed in the early period of Haitian independence to protect the young state from French attempts to reclaim it as a colony. Local artisans reconstructed wooden and tile roofs over the grand gallery and batteries using traditional carpentry methods, and consolidated the stone galleries of the fortress. IFM also sponsored a traveling exhibition and a film about the history of the Citadelle, which was used for educational purposes in the United States.

Through donations and matching funds, WMF has worked with local community and government partners worldwide to safeguard and conserve places of historic value for future generations. To date, WMF has worked at more than 500 sites in 91 countries, including many UNESCO World Heritage Sites. WMF has worked at internationally famous tourist attractions, as well as lesser-known sites.

Among highly prominent projects, starting in 1990, are many temples at Angkor, Cambodia, including Preah Khan and Phnom Bakheng; the Château de Chantilly in Chantilly, France; the ghost town of Craco, Italy; many structures in Rome, including the Temple of Hercules, Santa Maria Antiqua, and the House of Augustus; several sites on Easter Island; various sites at ancient Luxor in Egypt; Lalibela in Ethiopia; San Ignacio Miní in Argentina; the ancient Maya city of Naranjo, Guatemala; the Segovia Aqueduct in Segovia, Spain; as well as 25 projects in Venice, Italy, over 20 years. WMF has also participated in projects in the United States, including Ellis Island, Taos Pueblo, Mesa Verde National Park, the Mount Lebanon Shaker Society, and many sites in New Orleans and the Gulf Coast.