The American Society for Indexing, Inc. (ASI) is a national association founded in 1968 to promote excellence in indexing and increase awareness of the value of well-written and well-designed indexes. ASI serves indexers, librarians, abstractors, editors, publishers, database producers, data searchers, product developers, technical writers, academic professionals, researchers and readers, and others concerned with indexing. As a national professional organization, it is devoted solely to the advancement of indexing, abstracting and related methods of information retrieval.

ASI is an Organizational Member of the National Information Standards Organization (NISO) and
the Society for Technical Communication (STC).