The World Assemblies of God Fellowship (WAGF), commonly known as the Assemblies of God (AG), is a global cooperative body or communion of over 170 Pentecostal denominations that was established on August 15, 1989. The WAGF was created to provide structure so that member denominations, which previously related to each other informally, could more easily cooperate on a global basis.

The organizational committee, in 1988 summarized the purposes for the WAGF: to promote and facilitate world evangelization; coordinate world relief; coordinate the use of media and other technological resources to promote the cause of Christ in a way pleasing to Him; provide a strong international platform to speak out on behalf of the suffering and persecuted churches; coordinate theological education; and produce an international directory of Pentecostal churches, missions and other Pentecostal agencies to help share information. Member denominations are independent and autonomous, but they are united by shared beliefs and history.

WAGF member denominations have varied histories. Most have roots in the interracial Azusa Street Revival in Los Angeles, California or other Pentecostal revivals around the world in the early twentieth century. The largest member denomination, Assembleia de Deus in Brazil, dates its beginning to 1911. Initially called Missão de Fé Apostólica (Apostolic Faith Mission), it changed its name in 1918 to Assembleia de Deus.

The Assemblies of God USA, organized in April 1914, was the first Pentecostal denomination to name itself Assemblies of God. The Assemblies of God USA was founded by about 300 preachers and laymen from 20 states and several foreign countries met for a general council in Hot Springs, Arkansas, United States. While most other U.S. Pentecostal denominations were regionally defined, the Assemblies of God claimed a broad nationwide constituency.

A new fellowship emerged from the meeting and was incorporated under the name General Council of the Assemblies of God in the United States of America.

In time, self-governing and self-supporting general councils broke off from the original fellowship or formed independently in several nations throughout the world, originating either from indigenous Pentecostal movements or as a direct result of the indigenous missions strategy of the General Council. In 1919, Pentecostals in Canada united to form the Pentecostal Assemblies of Canada, which formally affiliated with the Assemblies of God USA the following year. The Assemblies of God in Great Britain formed in 1924 and would have an early influence on the Assemblies of God in Australia, now known as Australian Christian Churches. The Australian Assemblies of God formed in 1937 through a merger of the Pentecostal Church of Australia and the Assemblies of God Queensland. The Queensland AG had formed in 1929; though, it was never formally affiliated with the AG in America. The Assemblies of God of South Africa, founded in 1925, like the AG Queensland was also not initially aligned with the US fellowship.

Before 1967, the Assemblies of God USA, along with the majority of other Pentecostal denominations, officially opposed Christian participation in war and considered itself a peace church. The US Assemblies of God continues to give full doctrinal support to members who are led by religious conscience to pacifism.

Through foreign missionary work and establishing relationships with other Pentecostal churches, the Assemblies of God expanded into a worldwide movement. It was not until 1989 that the world fellowship was formed.