The 44-year-old journalist of Nigerian and Swiss-German descent is expected to take over from Edward Enninful, the editor-in-chief.
Enninful, who enjoyed a six-year tenure as both the prestigious fashion magazine’s first male and first black editor, announced his resignation in June.
It is understood that Nnadi will be known as head of editorial content, rather than editor-in-chief.
Nnadi’s appointment also makes her the first black female head of the industry-leading fashion magazine.
In an Instagram post on Monday, the London-born journalist said she is “honoured and excited to be coming home”.
“I’m so thrilled to announce that I’m the new head of editorial content for @britishvogue,” she wrote.
“Huge thanks to Anna Wintour, @edward enninful and Roger Lynch for giving me this opportunity. truly honoured and so excited to be coming home. Stay tuned.”
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Nnadi is currently the editor of the New York-based Vogue.
She has spent 13 years as a writer and news director for the magazine.
She began her career as a feature writer for the Evening Standard Magazine before moving to New York to write for Trace.
Nnadi will take over the role officially on October 9,
