Islamic religious police are official Islamic vice squad police agencies, often in Muslim-majority countries, which enforce religious observance and public morality on behalf of national or regional authorities based on its interpretation of sharīʿah. Modern Islamic religious police forces were first established in the late-1970s amidst the Iranian Revolution (1979) and the Islamic revival that the event brought to the Muslim world; prior, the administration of public morality in most Muslim-majority countries was considered a socio-religious matter, and was enforced through application of civil laws and/or through more informal means.

A vice is a practice, behaviour, or habit generally considered morally wrong in the associated society. In more minor usage, vice can refer to a fault, a negative character trait, a defect, an infirmity, or a bad or unhealthy habit. Vices are usually associated with a fault in a person's character or temperament rather than their morality.