PARIS — Olympic boxing champion Imane Khelif has filed a legal complaint in France for online harassment after a rain of criticism and false claims about her sex during the Paris Olympics, her lawyer said Sunday.

Khelif, who will be Algeria’s flag bearer in the closing ceremony, won gold Friday in the women’s welterweight division, becoming a new hero in her native Algeria and bringing global attention to women’s boxing.

The complaint was filed Friday with a special unit in the…