Circulation

Circulation may refer to:

Science and technology

 * Atmospheric circulation, the large-scale movement of air
 * Circulation (physics), the path integral of the fluid velocity around a closed curve in a fluid flow field
 * Circulatory system, a biological organ system whose primary function is to move substances to and from cells
 * Circulation problem, a generalization of network flow problems
 * Circulation (architecture), the flow of people through a building
 * Circulation (currency), all currency held by consumers and businesses, but not by financial institutions and governments
 * Exhaust gas recirculation, a nitrogen oxide reduction technique used in most gasoline and diesel engines
 * Library circulation, the activities around the lending of library books and other material to users of a lending library
 * Ocean circulation, the large-scale movement of water
 * Rhetorical circulation, the ways that texts and discourses move through time and space

Other uses

 * Print circulation, the average number of copies of a publication
 * Circulation Festival, an annual circus and fire performance festival held in Dunedin, New Zealand
 * Circulation (film), a 2008 psychological thriller-fantasy film by Ryan Harper
 * Circulation (journal), a journal published by the American Heart Association