Turkey has for the first time allowed policewomen to wear headscarves while on duty as part of their uniform.
Women serving in the police force "will be able to cover their heads" under their caps or berets so long as the headscarf is "the same colour as the uniform and without pattern", said the ruling published in the government's Official Gazette on Saturday.
It came into force immediately.
The ruling Justice and Development Party (AKP) has long pressed for the removal of restrictions on women wearing the headscarf in the officially secular state.
Turkey lifted a ban on the wearing of headscarves on university campuses in 2010.
It allowed female students to wear the garment in state institutions from 2013 and in high school in 2014.