"Adiós" (English: "Goodbye") is a song recorded by Puerto Rican singer Ricky Martin for his tenth studio album, A Quien Quiera Escuchar (2015). It was released as the album's lead single on September 23, 2014 through Sony Music Latin. "Adiós" was written and produced by Martin, Yotuel Romero and Antonio Rayo with an additional production from Jesse "Belief" Shatkin. Four versions were released of the song: Spanish, English, English-French and English-Turkish (the latter featuring Turkish singer Ayşe Hatun Önal).

"Adiós" was written and produced by Martin, Latin rapper Yotuel Romero and Japanese-Spanish flamenco virtuoso Antonio Rayo with an additional production from American producer Jesse "Belief" Shatkin. It was launched as the lead single from Martin's tenth studio album set to be released in early 2015. Regarding it, Martin spoke, "We chose [the song] because it represents who I am today. The title is a reference to the opening of another cycle." "Adiós" premiered on September 22, 2014 on Uforia's radio stations in the United States and Puerto Rico. The single has been released to digital retailers on September 23 in three versions, Spanish, English and English-French. A mambo remix of the song was released on September 30, 2014 and features fellow Puerto Rican performer Nicky Jam.

"Adiós" is a world music-flavored song with a length of three minutes and fifty-eight seconds.Idolator's Mike Wass opined that the diversity of the personnel behind the song contributed to its sound. The single features "original sound" and influences from throughout different parts of the world in which Martin traveled in 2014.

Haley Longman of OK! praised Martin's multilingualism and wrote that with "Adiós" he transformed it in a song form. Mike Wass of the website Idolator noted how the song's release in various languages was due to Martin's worldwide stardom. He further found the singer in a "sedate mood", similar to "Michael Bublé with a very exotic twist" and was more in favor of the Spanish version, noting how its chorus and instrumental breakdown were its key parts.

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