The UN tabbed the fictional superheroine to lead a year-long campaign for the "empowerment of women and girls."
But a website created by protesters slammed Wonder Woman as "the epitome of a 'pin-up' girl" -- "a large-breasted white woman of impossible proportions, scantily clad in a shimmering thigh-baring body suit with an American flag motif."
Adding to the Hollywood feel, the announcement was made in the presence of the actress Lynda Carter, now 65, who played the part on television, and of Diane Nelson, president of DC Entertainment, the company that owns the rights to the character.
Ban's undersecretary-general for communications, Cristina Gallach, described Wonder Woman as "an icon for her commitment to justice, peace and equality."
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In the back of the room several dozen protesters, both women and men, turned their back to the podium, some of them holding up clenched fists.
The campaign launch coincides with the 75th anniversary of Wonder Woman's first appearance in a comic book, and ahead of Warner Bros.'s release of a film centered on the statuesque character next year.
Some 350 UN employees had signed a petition urging Ban to drop the Wonder Woman plan.
Visitors to the protesters' website posted scathing comments, saying "this is a bad joke on all of us," "absolutely offensive to women" and adding that "to be empowered, women need leadership positions at the UN."
Gallach, the UN communications chief, said she was aware of such views, but that what mattered more than Wonder Woman's appearance were "the values and substance that she will represent."