La Llave de la Puerta Secreta ("The Key of the Secret Door" in English) is the eight studio album by Argentine hard rock band Rata Blanca released by PopArt Music in 2005. Produced by Walter Giardino, the album was a commercial success, particularly in Argentina, where it sold well enough to be certified Platinum by the CAPIF that same year. The album includes the hit single "Aún Estás en Mis Sueños", which became the band's new classic and a perennial radio favorite.

La Llave de la Puerta Secreta was recorded at La Nave de Oseberg Studios, in Buenos Aires and mixed at Sonovox Studios in Madrid, Spain. Some lyrics of this were based on Dan Brown novel The Da Vinci Code. The first CD packages were released with a digipack booklet with a little key (similar to the cover album). Simultaneously with the album's release, the band kicked off their tour in Latin America and Europa, with the bulk of concerts taking place in Argentina, Perú, Spain, Chile, Bolivia, Uruguay, Colombia, Ecuador, México, United States, Venezuela y Paraguay during June 2005 to August 2008.

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