Keystone

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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 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

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

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, Nebraska
Keystone, North Dakota
Keystone, Ohio
Keystone, South Dakota, a town near Mount Rushmore
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

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

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

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

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