Mother tongue usually refers to a person's first language.
Mother tongue may also refer to:
Proto-Human language, the hypothetical most recent common ancestor of all the world's languages,
The Mother Tongue (book), a history of the English language by Bill Bryson,
Mother Tongue (journal), a periodical published by the Association for the Study of Languages in Prehistory,
Mother Tongue (film), a 1993 film featuring Craig Parker,
Mother Tongue Records, a UK record label,
Mother Tongue (band), an American rock band featuring Jesse Tobias,
"Mother Tongue", a song by Dead Can Dance from The Serpent's Egg,
Native Tongue (album), 1993, Bret Michaels, Ritchie Kotzen, Bobby Dall, Rikki Rokket.