Meghan Markle and Michelle Obama, who have both been vocal in their calls for gender equality worldwide, will also be joined by actress Priyanka Chopra Jonas for the three-day virtual event. All three women will be guest speakers at the Girl Up Global Leadership Summit, which is being held from July 13-15.
Mrs Obama is due to deliver a special message to attendees at the virtual summit, while Ms Chopra will host a Q&A session.
Meghan is also due to speak at the event.
Girl UP announced Meghan would be joining the summit on Twitter earlier today.
They wrote: “The present is female!
“But don’t take our word for it. Hear Meghan Markle, The Duchess of Sussex’s advice for global girls leaders when she takes the stage at the 2020 @GirlUp Leadership Summit, happening virtually July 13-15!”
Girl Up was founded by the United Nations Foundation in 2010 and aims to give girls the resources and platform to start a movement for social change from anywhere in the world.
The organisation runs 3,500 clubs worldwide and has worked with more than 65,000 girls to promote gender equality.
Other women due to speak at the event include Nadia Murad, the 2018 Nobel Peace Prize winner, feminist commentator and women’s rights activist Liz Plank and Sheryl Sandberg, Facebook’s chief operation officer.
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She said: “I remember feeling shocked and angry and also just feeling so hurt; it just wasn’t right, and something needed to be done.
“So I went home and told my dad what had happened, and he encouraged me to write letters, so I did, to the most powerful people I could think of.”
Meghan said she wrote to Hillary Clinton, who was the First Lady at the time, a journalist who presented on a children’s news programme, a lawyer and the soap manufacturer.
Several weeks later Meghan received letters of support from the First Lady and the TV channel – who later covered the story.
The soap manufacturer also responded to the Meghan, and changed their slogan from “Women all over America” to “People all over America”.
In response, Meghan said: “It was at that moment that I realised the magnitude of my actions.
“At the age of 11, I had created my small level of impact by standing up for equality.”