Ones (Spanish: Unos) is a compilation album by American singer Selena, released in the United States on October 1, 2002 by EMI Latin.

The album was aimed at Selena's new generation of fans, and its release marked the singer's twentieth year in the music industry.

Ones received a positive reception among music critics, while Jon O'Brien of AllMusic noticed that the record label ignored Selena's self-titled debut album.

On March 31, 1995, American Tejano music singer Selena was shot and killed by Yolanda Saldívar, her friend and former manager of her boutiques.

[9] EMI Latin re-released Selena's previous works, which were remastered and included bonus tracks, music videos, and spoken liner notes containing commentary and recollections from the singer's family, friends, and her band.

"No Debes Jugar", the lead single from Live!, was praised by critics for its distinguishable cumbia music sounds that ultimately became her trademark.

[19][20][21] "No Me Queda Más", the third recording off of Amor Prohibido, was praised for the singer's vocal interpretations and her ability to tackle such a song reserved for established musicians twice her age.

[22] Another song from Amor Prohibido, "Fotos y Recuerdos", which sampled the Pretenders' 1983 single "Back on the Chain Gang", peaked at number one following Selena's death in April 1995.

Selena's duet with the Barrio Boyzz on their 1994 single "Donde Quiera Que Estés" is also featured on Ones, the track topped the Hot Latin Songs chart for six consecutive weeks.

Ramiro Burr of the San Antonio Express-News compared Ones to the greatest hits releases of Buddy Holly, Janis Joplin and Jimi Hendrix.

[25] Jon O'Brien of AllMusic noticed that the company intentionally wanted to focus on Selena's career between 1990 and 1995, ignoring her 1989 debut album.

[24] The iTunes editorial team found Ones as a showcase of the singer's versatile soprano voice that inspires one to dance or be brought with emotion.

[33][34] On the chart's April 17, 2004 list, Ones rose to number 11, receiving the highest percentage gains for an album that week, which was followed by the singer's ninth anniversary of her death.

[42][43][44] After its revision, Ones claimed the number one position on the Latin Pop Albums chart within three weeks, dethroning CNCO's Primera Cita (2016).

[49] On July 12, 2018, Ones reached number one on iTunes' Latin Albums chart, out-selling living musicians recent releases including Maluma's F.A.M.E.