"O Tú o Ninguna" (English: "Or You Or Nobody") is a song written by Juan Carlos Calderón and produced and performed by Mexican singer Luis Miguel. The song is a bolero in which the protagonist cannot envision his life without anyone else besides his love interest. It was released as the second single from the album Amarte Es un Placer on 6 September 1999. The track reached the top of the Billboard Hot Latin Songs chart in the United States and peaked number seven on the Brazilian Singles Chart.

"O Tú o Ninguna" received positive reviews from music critics who praised Miguel's delivery. It received a Latin Grammy nomination for Song of the Year in 2000. Calderón received a ASCAP Latin Award for the song in the same year. A music video for the track was filmed in San Francisco, California and directed by Rebecca Blake. In the video, Miguel searches for his love interest amidst the large crowd in the city.

In 1997, Luis Miguel released his twelfth studio album Romances, the third record in his Romance series on which he covers classic Latin American boleros. It sold over 4.5 million copies and won the Grammy Award for Best Latin Pop Performance in 1998. To promote Romances, he embarked on a tour of the United States, Latin America, and Spain lasting over a year. By 1998, Miguel was considered the most popular Latin artist internationally and his albums had sold over 35 million copies worldwide. Miguel began a relationship with American singer Mariah Carey the following year. After an absence of two years on the music scene, Miguel announced on 19 July 1999 that he would release a new album by September. He said the upcoming album would be a return to pop recordings as opposed to the bolero cover versions he had recorded on the Romance series. He denied rumors that he was planning to record a duet with Carey. The album's final title, Amarte Es un Placer was announced on 17 August 1999.

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