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"Quién" is a latin pop song by Guatemalan recording artist Ricardo Arjona, released on 19 June 2007 as the lead single from his compilation album, Quién Dijo Ayer (2007). The song's lyrics were written by Arjona, and its music was composed by Puerto Rican singer-songwriter Tommy Torres, who also worked with Arjona on his tenth studio album, Adentro (2005). Performed with additional background vocals by Torres, "Quien" was produced by Arjona with longtime collaborators Dan Warner and Lee Levin under their stage name Los Gringos, and was recorded between several studios in Miami and Mexico City.
Described by Arjona as "the world out of the window and the prison built by ourselves", "Quién" became a moderate commercial success, reaching number 21 on the US Billboard Top Latin Songs chart, and number four at the Latin Pop Songs chart. Its accompanying music video, directed by Simon Brand, was filmed in Las Vegas, and features Arjona singing while walking around the city's nighttime lights. A "jewel of elegance", according to Mexican website Terra, the music video has received 1.3 million views on YouTube.