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"Beachwear manifesting religious affiliation in an ostentatious way, while France and its religious sites are currently the target of terrorist attacks, could create the risk of disturbances to public order," the ruling says.
A spokeswoman for his office confirmed that the ordinance — in effect through the month of August, peak tourist season on the French Riviera — applies to burkinis. Violators face a fine.
Security has been stepped up across France in wake of the Nice attack, with soldiers prominently patrolling the beaches and promenades of the Riviera.
The ordinance was issued on July 28 but only publicized on Friday.
Lisnard told the Nice Matin newspaper that the ban was designed to "protect the population" in the context of France's ongoing state of emergency and terror threat.
Cassandra Vinograd is a Senior Writer and News Editor. Before joining NBC News, she worked as a London-based correspondent for The Associated Press and specialized in politics, foreign affairs and defense.
Vinograd previously worked as an editor for The Wall Street Journal in Brussels and London.
She has reported extensively from Afghanistan and on West Africa and the Middle East.