A conspiracy of silence, or culture of silence, describes the behavior of a group of people that by unspoken consensus does not mention, discuss, or acknowledge a given subject. The practice may be motivated by positive interest in group solidarity or by negative impulses such as fear of political repercussion or social ostracism. Unlike a taboo subject or the use of euphemisms, a conspiracy of silence is limited to specific social and political contexts rather than to an entire culture.
Some instances of such a practice are sufficiently well-known or enduring to become known by their own specific terms, including the code of silence, the refusal of law enforcement officers to speak out against crimes committed by fellow officers, and omertà, the cultural code of organized crime in Sicily.
Compare the Streisand effect, where deliberate efforts to suppress a particular topic or information result instead in increased awareness of the subject.