Decipher is the second album by Dutch symphonic metal band After Forever, released in 2001. In this album, the band make use of live classical instruments and a complete choir to back up the soprano voice of lead singer Floor Jansen. Thrown in the mix are also a duet of soprano and tenor voices in "Imperfect Tenses" and the recording of the late Israeli PM Yizhak Rabin voice during the Peace treaty signing ceremony on October 26, 1994 on "Forlorn Hope". This is the last After Forever album with guitarist and founder Mark Jansen, who left the band soon after its release.
The album has been re-released by Transmission Records in 2003 in a limited edition of 5,000 copies worldwide. The limited edition in digipack had an extended booklet, a sticker with new artwork and two bonus live tracks.
The album was re-released in 2012 as a 2-disc set by the re-financed Transmission Records.