"El Chico del Apartamento 512" (English: "The Boy in Apartment 512") is a song by American Tejano pop singer Selena. "El Chico del Apartamento 512" was the sixth single released from her album Amor Prohibido (1994). The song was written and produced by A.B. Quintanilla III, Ricky Vela, Joshua Munoz, Bebu Silvetti, Steven Torres and James Moore. It was released in the United States for Tejano and Contemporary Latin radio stations and was released as a promotional single a day before Selena was murdered on March 30, 1995. Selena promoted the song during her Amor Prohibido Tour, the song was included in every venue. Her final performance was on March 14, 1995 during her concert Calle Ocho Festival in Miami, Florida, which attracted over 100,000 fans.
While being interviewed with La Nación, Selena told them that she recorded the song because she believed her fans would appreciate her choice in Latin-pop dance and wanted to gain fans, who weren't equianted with her music. "El Chico del Apartamento 512" was given mixed to positive reviews. Because the single was released a day prior to the death of Selena, the event jeopardize any further developments for a music video, to further promote the song. "El Chico del Apartamento 512" had never shared a position on Billboard and failed to impact any music chart globally. Selena's brother, who is the producer of her music, A.B. Quintanilla III stated that "El Chico del Apartamento 512" was a "Colombian Cumbia" song, while being interviewed for Selena's collection, "20 Years of Music". The song has been covered by many artists, with the most notable example being by Graciela Beltrán, who both recorded and sang in homage to Selena during the Selena ¡VIVE! tribute concert, which was held on April 9, 2005.