Ones (Spanish: Unos) is a compilation album by American singer Selena, released in the United States on October 1, 2002 by EMI Latin. It was released on November 11, 2002 in Spanish-speaking countries, while the limited edition included a bonus DVD of her music videos. Ones was released building on the popularity of the 1997 biographical film Selena. The album was aimed at Selena's new generation of fans, and its released marked the singer's twentieth year in the music industry. Ones features six number one singles namely, "Amor Prohibido", "Bidi Bidi Bom Bom", "No Me Queda Más", "Fotos y Recuerdos", and her duets with Álvaro Torres on "Buenos Amigos" and the Barrio Boyzz on "Donde Quiera Que Estés".
Selena's brother, A.B. Quintanilla, remixed three of her singles ("Amor Prohibido", "Como la Flor" and "Si Una Vez") into a medley mash-up entitled "Con Tanto Amor Medley", the same tracks found on the album. 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. The recording peaked at number two on the US Billboard Top Latin Albums and number one on the Latin Pop Albums charts. Ones peaked at number 159 on the Billboard 200 chart and was certified 18× platinum by the Recording Industry Association of America (RIAA), signifying 1,080,000 album-equivalent units sold in the United States.