The Society of Indexers promotes indexing, the quality of indexes and the profession of indexing. Founded in 1957, it is the only autonomous professional body for indexers in the United Kingdom and Ireland, and membership is open to any person who is or intends to be directly involved in indexing.

The Society runs a well-established training course, successful completion of which leads to accreditation and professional membership. It also organizes conferences and seminars, workshops and local group meetings, and publishes an international journal, The Indexer, and a members’ newsletter. Qualified indexers are listed in the Directory of Professional Indexers.