The curfew bans all movement from 22:00 to 04:00 (17:30-23:30 GMT), apart from in the capital Kabul and two other provinces.
The interior ministry said the new curfew was "to curb violence and limit the Taliban movements", adding that Kabul, Panjshir and Nangarhar were exempt.
As the Taliban continues to advance, fierce clashes have taken place this week outside the city of Kandahar.
Some US analysts fear the Taliban could take control of the country within six months.
The militant group is thought to have captured up to half of all territory.
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