Iranian women have been warned to be on the look-out for cameras hidden in places where they undress, such as fitting rooms, gyms and swimming pools.
The chief of Iran’s police, Esmail Ahmadi Miqadam, said some shop owners were fitting spy cameras themselves.
Iranian authorities want to stop a wave of secretly-filmed pornographic DVDs hitting markets and internet sites.
President Mahmoud Ahmadinejad has been championing a drive to banish unwanted Western cultural influences from Iran.
Last year, Western and “indecent” music was banned from state-run TV and radio stations.
Correspondents say the release of pornographic DVDs of privately-filmed events is a growing trend in Iran.