Turkey's interior ministry said it imposed a two-day lockdown in 31 cities, including Istanbul and Ankara, starting at midnight.
The curfew is ordered in the capital Ankara, Adana, Antalya, Aydin, Balikesir, Bursa, Denizli, Diyarbakir, Erzurum, Eskisehir, Gaziantep, Hatay, Istanbul, Izmir, Kahramanmaras, Kayseri, Kocaeli, Konya, Malatya, Manisa, Mardin, Mersin, Mugla, Ordu, Sakarya, Samsun, Sanliurfa, Tekirdag, Trabzon, Van and Zonguldak, the ministry was quoted by Anadolu news agency as saying in a statement.
A circular on the issue was sent to the governorships, it added.
Bakeries, hospitals, pharmacies and workplaces producing health products and medical supplies would continue to operate, the circular said.
The curfew would not be applicable for people who will be carrying out burial procedures for their first degree relatives and those who have an appointment for blood and plasma donation for the Turkish Red Crescent.
Also, Turkey's Interior Minister Suleyman Soylu called on people to remain calm and urged against panic buying, saying the curfew will end on Sunday midnight.
"This is not a normal curfew," Soylu said, adding it is one of the measures taken to combat COVID-19.