Disapproval voting is any electoral system that allows many voters to express formal disapproval simultaneously, in a system where they all share some power. Unlike most electoral systems, it requires that only negative measures or choices be presented to the voter or representative. If used to select candidates for an office, or for continuation to a next round of voting or play, it is either single- or multi-winner, as everyone who is not disapproved of is in effect a winner, for that round.

A referendum or a recall election may be said to be minimal forms of disapproval voting. However, usually only one measure or candidate is presented to be disapproved of. True disapproval voting would require more than two choices or representatives, and would ask voters to disavow one or more.