Keystone or key-stone may refer to:

  • Keystone (architecture), a central stone or other piece at the apex of an arch or vault
  • Keystone (cask), a fitting used in ale casks

Companies

  • Keystone Law, a full-service law firm
  • Digital Keystone, a developer of digital entertainment software
  • Keystone Aircraft Corporation
  • Keystone Bridge Company, an American bridge building company
  • Keystone (beer brand)
  • Keystone Camera Company
  • Keystone (gasoline automobile)
  • Keystone (steam automobile)
  • Keystone Pipeline, a crude oil pipeline
  • Keystone-SDA/Keystone-ATS, a Swiss press agency
  • Keystone View Company, a US photo agency
  • Keystone (Berkeley, California), a defunct music club

Education

  • Keystone Academy, a private K–12 school in Shunyi, Beijing, China
  • Keystone College, a private college in Pennsylvania, United States
  • Keystone Exam, a standardized test at public schools in Pennsylvania, United States
  • Keystone School, a private K–12 school in San Antonio, Texas, United States
  • Keystone School Online, a private for-profit online K–12 school based in Herndon, Virginia, United States
  • Keystone, an education program at the U.S. National Defense University

Entertainment

  • Keystone (video game), part of the Xbox Live Arcade title Fable 2 Pub Games
  • Keystone (band), led by jazz trumpeter Dave Douglas
  • Keystone (album), a 2005 album by the band
  • Keystone Cops, a silent movie series
  • Keystone Kapers, a classic Atari game
  • Keystone Studios, a movie studio

Places

  • The Keystone asterism in the Hercules constellation

United States

  • The "Keystone State", nickname for the U.S. Commonwealth of Pennsylvania
  • Keystone, Colorado, a town
  • Keystone Resort, the related ski resort
  • Keystone, Florida, an unincorporated community
  • Keystone, Indiana
  • Keystone, Iowa
  • Keystone, Missouri
  • Keystone, Nebraska
  • Keystone, North Dakota
  • Keystone, Ohio
  • Keystone, South Dakota, a town near Mount Rushmore
  • Keystone, Washington, an unincorporated community
  • Keystone, West Virginia
  • Keystone, Wyoming
  • Keystone at the Crossing, a business/shopping district in Indianapolis, Indiana
  • The Fashion Mall at Keystone, located in the Keystone shopping district
  • Keystone Heights, Florida
  • Keystone Canyon, Alaska
  • Keystone Lake, a resort area near Tulsa, Oklahoma
  • Keystone, Wisconsin

Canada

  • The "Keystone Province", a nickname for the Province of Manitoba
  • Keystone Centre, an arena and exhibition centre in Brandon, Manitoba

Fictional locations

  • Keystone City, home of the comic book character The Flash
  • Keystone City, a holographic city in the Star Trek: The Next Generation episode "Emergence"

Railroads

  • Keystone Corridor, a rail corridor from Philadelphia to Pittsburgh
  • Keystone Service, a current New York-Harrisburg service
  • Keystone (Amtrak train, 1979–1981), a predecessor of the current service
  • Keystone (Amtrak train, 1971–1972), a former New York-Pittsburgh service operated by Amtrak
  • Keystone, a former New York-Washington service operated by the Pennsylvania Railroad
  • Keystone (train), a lightweight train used for the service

Sports

  • Keystone Junior Hockey League, in Manitoba
  • Keystone Cup, Western Canadian Junior "B" ice hockey championship
  • Keystone (horse), a racehorse

Other uses

  • Keystone (limestone), quarried in the Florida Keys
  • Keystone effect, caused by projecting an image onto a surface at an angle, or by photography at an angle
  • Keystone Initiative, a medical protocol to reduce infection rates
  • Keystone module, a type of data connector mounted in walls and patch panels
  • Keystone Press Awards
  • Keystone species, species that have a larger effect on their environment than is purely due to their abundance
  • Operation Keystone, during World War II
  • Keystone, a variety of screwdriver blade
  • "Keystone", a descriptive reference to the Book of Mormon
  • The Keystone, journal of the Pennsylvania Railroad Technical and Historical Society
  • The Keystone, Pennsylvania news website owned by Courier Newsroom

See also

  • Stone (disambiguation)
  • Key (disambiguation)
  • The Stone Key (2008 novel) post-apocalyptic novel by Isobelle Carmody
  • Stone Key Partners (bank) U.S. boutique investment bank