Foot voting is expressing one's preferences through one's actions, by voluntarily participating in or withdrawing from an activity, group, or process; especially, physical migration to leave a situation one does not like, or to move to a situation one regards as more beneficial. People who engage in foot voting are said to "vote with their feet".

Legal scholar Ilya Somin has described foot voting as "a tool for enhancing political freedom: the ability of the people to choose the political regime under which they wish to live". Communist leader Vladimir Lenin commented, "They voted with their feet," regarding Russian soldiers deserting the army of the Tsar. The concept has also been associated with Charles Tiebout, who pioneered the concept (although he did not use the term "foot voting") in a 1956 paper,^: 203 and with Ronald Reagan, who advocated migration between states of the United States as a solution to unsatisfactory local conditions.