A lisp is a type of speech impediment. Lisp may also refer to: Lisp (programming language), a family of computer programming languages Rhotacism (speech impediment), 'lisp' on the letter R Locator/Identifier Separation Protocol, a "map-and-encapsulate" Internet protocol Lisp Machines, a company that built Lisp machines out of MIT Lisp (band), an English trip hop band Lisp (group), the Japanese girl group Light Industry and Science Park, the industrial parks