Essential Logic is an English post-punk band formed in 1978 by saxophonist Lora Logic after leaving X-Ray Spex. The band initially consisted of Lora on vocals, Phil Legg on guitar and vocals, William Bennett (later of Whitehouse) on guitar, Mark Turner on bass guitar, Rich Tea on drums and Dave Wright on saxophone. Turner was later replaced by Jon Oliver on bass. The band split in 1981 and reformed in 2001.