Circulation may refer to:
Science and technology
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Atmospheric circulation, the large-scale movement of air
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Circulation (physics), the path integral of the fluid velocity around a closed curve in a fluid flow field
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Circulatory system, a biological organ system whose primary function is to move substances to and from cells
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Circulation problem, a generalization of network flow problems
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Circulation (architecture), the flow of people through a building
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Circulation (currency), all currency held by consumers and businesses, but not by financial institutions and governments
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Exhaust gas recirculation, a nitrogen oxide reduction technique used in most gasoline and diesel engines
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Library circulation, the activities around the lending of library books and other material to users of a lending library
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Ocean circulation, the large-scale movement of water
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Rhetorical circulation, the ways that texts and discourses move through time and space
Other uses
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Print circulation, the average number of copies of a publication
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Circulation Festival, an annual circus and fire performance festival held in Dunedin, New Zealand
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Circulation (film), a 2008 psychological thriller-fantasy film by Ryan Harper
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Circulation (journal), a journal published by the American Heart Association
