Barbier may refer to:
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Barbier (surname) Barbier is a French surname. Notable people with the surname include:
* Antoine Alexandre Barbier (1765–1825), French librarian
* Carl Barbier (born 1944), U.S. Federal Judge, Eastern District of Louisiana
* Charles Barbier (1767–1841), French ...
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Barbier (crater), a feature on the Moon
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Barbier reaction, a reaction in organic chemistry
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Barbier's theorem
In geometry, Barbier's theorem states that every curve of constant width has perimeter times its width, regardless of its precise shape. This theorem was first published by Joseph-Émile Barbier in 1860.
Examples
The most familiar examples of c ...
in mathematics
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