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Quién Dijo Ayer (English: Who Said Yesterday) is a compilation album released by Guatemalan singer-songwriter Ricardo Arjona on August 21, 2007. Dan Warner and Lee Levin co-produced the album with Arjona and Puerto Rican singer-songwriter Tommy Torres. It was recorded in the United States, Mexico, Italy and Argentina, and is the last album Arjona released under the Sony Music Entertainment label before signing with Warner Music Group. 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.
Critically and commercially successful, Quién Dijo Ayer topped the US Billboard Latin Pop Albums chart and reached number two on the Top Latin Albums chart. The album became a hit in Latin America, topping the Mexican albums chart and receiving gold and Platinum certifications in several countries including the United States. The album spawned two commercially successful singles, "Quién", which reached number four on the Billboard Latin Pop Songs chart, and "Quiero", which reached number eight.