Rights groups have branded the event a step backward on race issues.
In a series of angry tweets today, Mayor Anne Hidalgo said she would call on authorities to prohibit the three-day cultural festival scheduled for July.
Hidalgo said she might call for the prosecution of its organizers on grounds of discrimination.
"I firmly condemn the organization of this event in Paris (that's) 'forbidden to white people,'" Hidalgo wrote.
The program for the first annual Nyansapo Festival, which is set to run July 28-30 at a Paris cultural center, states that 80 per cent of the event space only will be accessible to black women.
Other sections will be open to black men and "racialized women," and one smaller space will be open to everyone regardless of race.
Organizers hope the festival will travel around Europe in coming years and said on the event's website that "for this first edition we have chosen to put the accent on how our resistance as an Afro-feminist movement is organized."
The International League Against Racism and Anti-Semitism (LICRA), meanwhile, called the festival a "regression" and said American civil rights icon "Rosa Parks must be turning in her grave."
Identity politics remain a recurrent hot potato in a nation where collecting data based on religious and ethnic backgrounds is banned and the wearing of religious symbols -- such as the full Islamic veil - in public is prohibited.
Last week, several women attempting to stage a "burkini party" were detained in Cannes after a ban against the full- body beachwear favored by some Muslim women was upheld in a fresh decree.
The "'burkini" event was to highlight anger against the ban, which is part of a French secular law that bans the wearing of headscarves and other religious clothing in public areas.
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