Ethnologue: Languages of the World is a web and print publication of SIL International (formerly known as the Summer Institute of Linguistics), a Christian linguistic service organization, which studies lesser-known languages, to provide the speakers with Bibles in their native language and support their efforts in language development.

The Ethnologue contains statistics for 7,358 languages in the 16th edition, released in 2009 (up from 6,912 in the 15th edition, released 2005 and 6,809 in the 14th edition, released 2000) and gives the number of speakers, location, dialects, linguistic affiliations, availability of the Bible and so forth. It is currently the most comprehensive existing language inventory, along with the Linguasphere Observatory Register. But, some information is dated.

In 1984, the Ethnologue released a three-letter coding system, called a SIL code, to identify each language that it describes. This set of codes significantly exceeded the scope of previous standards, e.g., ISO 639-1. The 14th edition, published in 2000, included 7148 language codes which generally did not match the ISO 639-2 codes. In 2002 the Ethnologue was asked to work with the International Organization for Standardization (ISO) to integrate its codes into a draft international standard. The Ethnologue now uses this standard, called ISO 639-3. The 15th edition, which was published in 2005, includes 7299 codes. A 16th edition was released in the middle of 2009.