"Forbidden Colours" is a song composed by Ryuichi Sakamoto with lyrics by David Sylvian. The song is the vocal version of the theme from the Nagisa Oshima film Merry Christmas, Mr. Lawrence (in certain territories retitled Furyo) and was first released on the soundtrack album. "Forbidden Colours", also issued as a duet single on Virgin Records in 1983, was the second collaborative single release by Sylvian and Sakamoto, following 1982's "Bamboo Houses".
In 1984 the track was re-recorded and released as the B-side to "Red Guitar", the lead single to Sylvian's first solo album Brilliant Trees and was later also included as a bonus track on certain editions of his 1987 album Secrets of the Beehive. Both Sakamoto and Sylvian have since recorded several interpretations of the song, both instrumental (under the title "Merry Christmas, Mr. Lawrence") and vocal. An orchestral version featuring vocals by Sylvian was included on Sakamoto's 1999 album Cinemage.