Quién Dijo Ayer (English: Who Said Yesterday) is a compilation album released by Guatemalan singer-songwriter Ricardo Arjona on 21 August 2007.

Dan Warner and Lee Levin co-produced the album with Arjona and Puerto Rican singer-songwriter Tommy Torres.

It is Arjona's first compilation to include new material in the form of re-recorded versions of past hits in different musical genres from the original recordings, featuring guest artists such as Marc Anthony, Marta Sánchez and Mexican ska band Panteón Rococó, among others.

In a press conference, Arjona stated that "yesterday is the cumulus of this that put us here, which raised us and made us what we are, for good or bad.

"[1] He also said that Quién Dijo Ayer was more than a compilation, and that "it's an album with all the features of the typical greatest hits disc.

[2] Iñigo Zabala, chairman of Warner Music Latin America commented that "He's an artist that fits perfectly with our company," and that "We are a label that has a major catalog of songwriters and quality pop and rock from the likes of Maná, Alejandro Sanz, Laura Pausini, and now, Arjona.

[3] For this compilation album, Arjona re-recorded some of his older songs in a different style from the original versions, and remastered others.

[5] "Historia De Taxi" was transformed into a salsa song, which Arjona performed with American singer Marc Anthony[4] and pianist Sergio George;[6] George said, "It's been interesting to work with two figures from different music worlds on the interest of making good music.

On this disc appears the duets with Panteón Rococó on "Si El Norte Fuera El Sur"; Marc Anthony on "Historia de Taxi"; Marta Sanchez on "Tarde (Sin Daños A Terceros)"; Eros Ramazzoti on "A Ti" and Sandro de América on "Realmente No Estoy Tan Solo".

[24] The first single released from the album was "Quién", a Latin pop song written by Arjona and produced by Tommy Torres and Los Gringos.

[27] Jason Birchmeier from Allmusic gave a positive review of the album, and commented that, "while only a couple of the new versions depart stylistically from the originals, the contemporary productions breathe new life into these songs, which should be well known by longtime fans.

[30][31][32] The album was commercially successful in Latin America, and was certified Gold in Venezuela, Uruguay, Colombia, Chile, and Peru;[33] and Platinum in Argentina, Mexico and the United States.