"Tonight at midnight the Eiffel Tower will go out in hommage to the victims of the horrific attack that struck Kabul," Hidalgo said.
"The city of Paris and Parisians are with the Afghan people who are once again facing terrorist barbarity."
At least 95 people were killed and 158 wounded on Saturday when an explosives-packed ambulance blew up in a crowded area of Kabul.
A statement from France's foreign ministry condemned Saturday's attack and offered support for Afghanistan's fight against "the scourge of terrorism."