Lora Logic (also spelt Laura Logic; born Susan Whitby c. 1960) is a British saxophonist, singer and songwriter from Wembley, London. Logic was a founding member of London punk band X-Ray Spex, and wrote the saxophone parts for their debut album, Germfree Adolescents. After leaving X-Ray Spex, Logic founded her own band, Essential Logic, which released one full-length album in 1979. Logic has been called "one of post-punk's most notable atypical girls."