Plural ignorance or pluralistic ignorance is a term which gives a name to a situation where a majority of group members privately reject a norm, but at the same time, they assume incorrectly that most others accept it. The term describes a context in which "no one believes, but everyone thinks that everyone believes."

A context of plural ignorance can be caused by the structure of the underlying social network.

A situation of plural ignorance develops when each individual decision-maker in a group of decision-makers does not have the necessary information to solve a problem.