Naughty Boys Instrumental(浮気なぼくら（インストゥルメンタル）,Uwaki na bokura (Instrumental); "Naughty boys"?) is the first remix album by Yellow Magic Orchestra. It contained nearly the entire Naughty Boys album as instrumental tracks in an entirely different running order, as well as the b-side to "Kimi ni, mune kyun.", "Chaos Panic"; and the full instrumental version of "You've Got to Help Yourself", which was released in "preview" form on the previous album. "You've Got to Help Yourself"'s vocal version is also featured on Service.
Naughty Boys Instrumental featured additional synthesizers imitating the vocal lines, as well as new embellishments and mixes. Several tracks featured sonically updated percussion tracks, while "Ongaku" featured an acoustic piano soloing over the piece.
Naughty Boys Instrumental was re-released in 2004 in a double disc package alongside Naughty Boys.