"No Sé Olvidar" (English: "I Don't Know How to Forget") is a song written by Kike Santander and performed by Mexican recording artist Alejandro Fernández. It was co-produced by Santander and Emilio Estefan and was released as the third single from Me Estoy Enamorando by Sony Music Mexico in 1997. The song is a bolero-pop ballad with ranchera influences and portrays the singer desperately trying to forget his lover. A music video was made for the track which features Fernández hopelessly attempting to not remember his lover only to slowly delve into insanity. It received a nomination for Video of the Year at the 1998 Lo Nuestro Awards.

It reached the top of the Billboard Hot Latin Songs chart in the United States and spent eight weeks at this position. The recording led to Fernández receiving a nomination for Hot Latin Track of the Year and Pop Hot Latin Track of the Year at the 1999 Billboard Latin Music Awards while Santander received a BMI Latin Award for the track in the same year.

Since 1992, Alejandro Fernández established his music career as a ranchera singer like his father, iconic ranchera singer, Vicente Fernández. His previous albums, Alejandro Fernández (1992), Piel De Niña (1993), Grandes Éxitos a la Manera de Alejandro Fernández (1994), Que Seas Muy Feliz (1995), and Muy Dentro de Mi Corazón (1996), helped solidify Fernández as a ranchera singer. Although his last album, Muy Dentro de Mi Corazón, was a success, Fernández did not want to simply record another ranchera album. "If I had released another album of just rancheras, people would have just expected the same thing, and then they would have begun to judge me by that one [musical] theme", Fernández explained. He also noted bolero's popularity on radio stations and cited his waning radio airplay. After listening to Mi Tierra by Gloria Estefan, Fernández sought Estefan's husband Emilio Estefan to have him produce Fernández's next album. After hearing Fernández's proposal, Emilio Estefan agreed on the idea to produce the album. Recording took place at Estefan's Crescent Moon Studios in Miami, Florida.

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