Principia may refer to:
* ''
Philosophiæ Naturalis Principia Mathematica
(English: ''Mathematical Principles of Natural Philosophy'') often referred to as simply the (), is a book by Isaac Newton that expounds Newton's laws of motion and his law of universal gravitation. The ''Principia'' is written in Latin and ...
'', Isaac Newton's three-volume work about his laws of motion and universal gravitation
* Principia ( "primary buildings"), the headquarters at the center of Roman forts ( la,
castra
In the Roman Republic and the Roman Empire, the Latin word ''castrum'', plural ''castra'', was a military-related term.
In Latin usage, the singular form ''castrum'' meant 'fort', while the plural form ''castra'' meant 'camp'. The singular and ...
, links=no)
*
The Principia
The Principia is an educational institution for Christian Scientists located on two campuses in the St. Louis, Missouri metropolitan area of the United States. Principia School, located in Town and Country, West St. Louis County, serves studen ...
, an educational institution for Christian Scientists in the St. Louis, Missouri, area
**
Principia College
Principia College (Principia or Prin) is a private liberal arts college in Elsah, Illinois. It was founded in 1912 by Mary Kimball Morgan with the purpose of "serving the Cause of Christian Science." "Although the College is not affiliated wit ...
, a private four-year college in Elsah, Illinois
** Principia School, a school from early childhood to high school in the St. Louis, Missouri, area
*
''Principia'' (alga), a stem-group coralline alga
* Principia, the former name of
Zope, the "Z Object Publishing Environment"
*
2653 Principia
__NOTOC__
Year 653 (Roman numerals, DCLIII) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar. The denomination 653 for this year has been used since the early medieval period, when the Anno Domi ...
, an asteroid named after Newton's work
*
''The Principia'' (book), by
Emanuel Swedenborg
* ''
Principia Mathematica'', a three-volume work on the foundations of mathematics by Bertrand Russell and Alfred North Whitehead
* ''
Principia Ethica'', a book on ethics by
G. E. Moore
George Edward Moore (4 November 1873 – 24 October 1958) was an English philosopher, who with Bertrand Russell, Ludwig Wittgenstein and earlier Gottlob Frege was among the founders of analytic philosophy. He and Russell led the turn from idea ...
* ''
Principia Discordia'', a Discordian religious text by Greg Hill (Malaclypse the Younger) and Kerry Wendell Thornley (Lord Omar Khayyam Ravenhurst)
* ''Principia'', astronaut
Tim Peake's mission as part of the Expedition 46 crew of the International Space Station
*
"Principia" (''Agents of S.H.I.E.L.D.''), season 5 episode 13 of Marvel's Agents of S.H.I.E.L.D.''
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