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 Exhaust gas recirculation, a nitrogen oxide reduction technique used in most gasoline and diesel engines Ocean circulation, the large-scale movement of water
Media Circulation (film), a 2008 psychological thriller-fantasy film by Ryan Harper Circulation (journal), a journal published by the American Heart Association Print circulation, the average number of copies of a periodical publication Library circulation, the activities around the lending of library books and other material to users of a lending library
Other uses 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 Rhetorical circulation, the ways that texts and discourses move through time and space