Yahoo! Babel Fish was a free Web-based multilingual translation application. In May 2012 it was replaced by Bing Translator, to which queries were redirected. Although Yahoo! has transitioned its Babel Fish translation services to Bing Translator, it did not sell its translation application to Microsoft outright. As the oldest free online language translator, the service translated text or Web pages in 36 pairs between 13 languages, including English, Simplified Chinese, Traditional Chinese,Dutch, French, German, Greek, Italian, Japanese, Korean, Portuguese,Russian, and Spanish.

On December 9, 1997, Digital Equipment Corporation (DEC) and SYSTRAN S.A. launched AltaVista Translation Service at babelfish.altavista.com,which was developed by a team of researchers at DEC. In February 2003, AltaVista was bought by Overture Services, Inc. In July 2003, Overture, in turn, was taken over by Yahoo!.

The internet service derived its name from the Babel fish, a fictional species in Douglas Adams's book and radio series The Hitchhiker's Guide to the Galaxy that could instantly translate languages. In turn, the name of the fictional creature refers to the biblical account of the confusion of languages that arose in the city of Babel.

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