App, Apps or APP may refer to:

• Application software, or app, a computer program designed to carry out a specific task
  • Mobile app, designed to run on a mobile device
  • Web application or web app, designed to run in a web browser
• App (file format), used by HarmonyOS
• 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

• Acute-phase protein, a class of proteins
• Amyloid-beta precursor protein, a protein
• Atactic polypropylene, a hot-melt adhesive

• App (film), a 2013 Dutch film
• 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
• Archive of Public Protests, a collective of photographers and writers and their work documenting protests in Poland
• The Alan Parsons Project, former British rock band

• 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 Players, a professional pickleball tour
• Association of Professional Piercers, an international organization for body piercing

• All People's Party (disambiguation), several political parties
• People's Progressive Alliance (Mauritania) (Alliance populaire progressiste)
• Animal Protection Party, in England
• Australian Protectionist Party
• Aggrupation of Parties for Prosperity, in the Philippines
• Alliance for the Homeland (Alianța pentru Patrie, ApP), in Romania

• Justice Defenders, formerly African Prisons Project, a charity
• Alberta Provincial Police, a former Canadian police force
• American Principles Project, a political advocacy group
• Asia-Pacific Partnership on Clean Development and Climate

• App (surname)
• Apps (surname)

• Appleby railway station, England, station code APP
• Appleton, Wisconsin, United States (by Amtrak station code)
• Assessing Pupils' Progress, an assessment methodology used in schools in England and Wales
• Advanced practice provider, another term for a mid-level practitioner

• .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
• Authorised push payment fraud, or APP fraud