  We introduce toric promotion as a cyclic analogue of Sch\"utzenberger's
promotion operator. Toric promotion acts on the set of labelings of a graph
$G$. We discuss connections between toric promotion and previously-studied
notions such as toric posets and friends-and-strangers graphs. Our main theorem
provides a surprisingly simple description of the orbit structure of toric
promotion when $G$ is a forest.
