App, Apps or APP may refer to:

• Application software
• Mobile app, software designed to run on smartphones and other devices

• Web application or web app, software designed to run inside a web browser
• App (file format), a file format used by HarmonyOS as an app package
• Adjusted Peak Performance, a metric to measure computing performance in 64-bit processors and above
• Application Portability Profile, NIST standards and specifications for the Open System Environment
• Atom Publishing Protocol, simple HTTP-based protocol for creating and updating web resources

• Advanced Placement Program, a program offering college-level curriculum and examinations to high school students
• Appalachian State University, a university in Boone, North Carolina, US
  • Appalachian State Mountaineers, the university's athletic program
• Assessing Pupils' Progress, an assessment methodology used in schools in England and Wales

• APP (film), a 2013 Dutch film that utilizes second screen technology
• Apps (film), a 2021 anthology horror fantasy film
• The App, a 2019 Italian drama
• Asbury Park Press, a newspaper of Monmouth County, New Jersey, US
• Associated Press of Pakistan, news agency of Pakistan
• Archive of Public Protests (Polish: Archiwum Protestów Publicznych), a collective of photographers and writers and their work documenting protests in Poland

• Acute-phase protein, a class of proteins whose concentration changes in response to inflammation
• Advanced practice provider, or mid-level practitioner, a class of healthcare providers
• Amyloid-beta precursor protein, a protein whose fragments are associated with Alzheimer's disease and other neurological disorders

• African Prisons Project, a UK-based NGO
• Alberta Provincial Police, a Canadian police force from 1917 to 1932
• American Principles Project, a libertarian and conservative political think tank
• Asia-Pacific Partnership, an international environmental protection alliance
• Asia Pulp & Paper, a pulp and paper company based in Jakarta, Indonesia
• Associated Press of Pakistan, a national news agency of Pakistan
• Association of Pickleball Professionals
• Association of Professional Piercers, an international organization for body piercing

• All People's Party (disambiguation), various political parties
• Alliance populaire progressiste or People's Progressive Alliance, a party in Mauritania
• Animal Protection Party, United Kingdom
• Australian Protectionist Party
• Austrian People's Party
• Aggrupation of Parties for Prosperity, a local Philippine party
• Alliance for the Homeland, a Romanian party
• American Principles Project, a think-tank
• Reason Party (Poland) (or Anticlerical Progress Party)

• App (surname)
• Apps (surname)

• Appleby railway station, England (by GBR code)
• Appleton, Wisconsin, United States (by Amtrak station code)

• Atactic polypropylene, a hot-melt adhesive
• Authorized push payment fraud (APP fraud), fraudulent diversion of funds
• App, a slang term for "appetizer"

• .app (disambiguation)
• All pages with titles beginning with App
• All pages with titles beginning with APP
• All pages with titles containing app
• All pages with titles beginning with Apps
• All pages with titles containing apps