Circulatory system, a biological organ system whose primary function is to move substances to and from cells

Atmospheric circulation, the large-scale movement of air

List of circulating currencies

Newspaper circulation, the average number of copies of a newspaper distributed on a day

Circulation problem, a generalisation of network flow problems

Library circulation, the activities around the lending of library books and other material to users of a lending library

Circulation (fluid dynamics), the path integral around a closed curve of the fluid velocity

Magazine circulation, the average number of copies of a periodical distributed per edition/ volume

Circulation (journal), a scientific journal published by the American Heart Association

Circulation (UK duo), a UK house music duo