The International Association of Scientologists (IAS) is an English non-profit organization, which was formed in October 1984 by a group of Scientologists, who assembled at Saint Hill Manor in East Grinstead, Sussex, England. The stated purpose of the IAS is "To unite, advance, support and protect the Scientology religion and Scientologists in all parts of the world, so as to achieve the aims of Scientology as originated by L. Ron Hubbard."

The IAS followed the Hubbard Association of Scientologists International as the official membership organization of the Church of Scientology. It does not accept Free Zone Scientologists.