"En Que Fallamos" (English: "In Which We Fail") is a song by Puerto Rican reggaetón recording artist Ivy Queen, from her sixth studio album, Sentimiento (2007). It was composed by Queen, produced by Rafi Mercenario, and released as the second single from the album in February 2007. Characterized as "hardcore reggaetón", the song lyrically tells a story of when a relationship ends. A remix with Ken-Y was also recorded and featured on the platinum edition of the album. The song's accompanying music video was filmed in Mexico beginning on July 3, 2007. It was directed by Ron Jaramillo. The song reached the top 15 of both the Latin Rhythm Airplay and Latin Tropical Airplay charts. Ivy Queen along with Ken-Y also performed the remix to the song as a part of the setlist of her 2008 World Tour which was held from the José Miguel Agrelot Coliseum, known as the Coliseum of Puerto Rico in San Juan, Puerto Rico as well on R.K.M & Ken-Y's Romantico 360° Tour in 2009.

Following the success of Queen's fifth studio album in 2005 in the Latin market, she began working on her sixth studio album in 2006. She wanted to create a new album with more slower and romantic reggaetón. This stemmed from Queen divorcing her husband of nine years and releasing all of her anger on Flashback. Not wanting to go into detail, she "acknowledged the songs were just one way she dealt with the end of an 11-year relationship". On the album, as a part of her evolution in reggaetón, she includes "solo turns", instead of duets by guest artist. Of the solo tracks on the album is "Pobre Corazón" by Divino while others include "Manaña Al Despertar" by Baby Rasta and Noriega where the artist performed songs without vocals by Ivy Queen. She said she wanted to give a 180-degree turn to what people think of reggaetón. She explained "Many think reggaetón is just nice rhythms to dance to. And they forget there are song-writers and composers, who, like everyone else, also suffer and aspire in love". She wanted the album to be about that. She said "Love is what makes us write things, what keeps us alive. If we did not have love, we would have nothing".

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