Soap is a surfactant cleaning compound used for personal or minor cleaning. Soap may also mean:
- Any fatty acid salt, which may have cleaning, lubricant, anticaking, cosmetic, or other uses
- Detergent, a substance with soap-like properties
- Soap shoes, a type of shoe made for grinding
In film:
- A Soap, (En Soap) from Nimbus Film, a 2006 Danish/Swedish co-produced film directed by Pernille Fischer Christensen. It was awarded at that years Berlin International Film Festival and starred Trine Dyrholm & David Dencik.
- Soap, a character from the 1998 British comedy Lock, Stock and Two Smoking Barrels
- Snakes on a Plane (SoaP), a 2006 movie starring Samuel L. Jackson
In television:
- Soap (TV series), an award-winning, controversial 1970s sitcom starring Katherine Helmond and Cathryn Damon
- Soap opera, a melodramatic television series
In fiction:
- "Soap", a fictional substance in the book Cloud Atlas
SOAP may mean: In computing:
- SOAP, a computing standard defining how to format messages used by web services
- Solaris Operating System, Oracle Database, Apache HTTP Server, and PHP; a collection of software packages used for web services — see LAMP (software bundle)
- Symbolic Optimal Assembly Program, assembly language used by the IBM 650 computer
- Satellite Orbit Analysis Program, computing software used for simulating satellite communications
- Syndicated Online Audio Programming, otherwise known as a podcast.
In electronics:
- Soap device, a mid-air pointing device built from optical mouse components.
Other uses:
- S.O.A.P., a duo of Danish singers
- Society for Obstetric Anesthesia and Perinatology (medicine)
- Subjective Objective Assessment Plan (medicine), an approach to medical record charting
- Small Operator Assistance Program (mining), a U.S. government initiative to provide financial and technical assistance to small coal mines
- Slang for a certain type of cannabis resin
