She also chose Smart Work, which helps long-term, unemployed women regain their skills, confidence and tools to do well in job interviews, as well as help with their transition back into employment.
The Duchess of Sussex spent ten years working in television but her training is in theatre.
In addition to The National Theatre, she will serve as patron of the Association of Commonwealth Universities, Mayhew, and Smart Works - all organizations that must we say are rather fitting for the Duchess of Sussex.More news: China trade talks extended as both sides tout progress
Smart Works is a charity that, in the five years since its inception, has helped 11,000 women across seven United Kingdom locations.
She also is now a patron of The National Theatre, The Association of Commonwealth Universities (ACU) and Mayhew.
"Members of the royal family can use their patronages to shape their legacy as members of the royal family", Murphy told ABC News.
Meghan will have an affinity with the National theatre after spending a decade working in television where she was best known for her role in the hit USA legal drama series Suits, playing paralegal-turned-lawyer Rachel Zane.
She started campaigning for gender equality at an early age, writing to the then United States first lady, Hillary Clinton, at the age of 11, lamenting a washing-up liquid's TV ad strapline: "Women all over America are fighting greasy pots and pans". "This country is still very class-driven and there is a perception, and anything that adds to the perception that this place is not for everyone can be a downfall".
'The Queen has held the roles for 45 and 33 years respectively. The Duchess shares our deeply-held conviction that theatre has the power to bring together people from all communities and walks of life. Speaking to HELLO!'s royal correspondent Emily Nash, Marina explained: "It's amusing, she said a year ago, someone was talking about confidence and we asked, 'how do you manage with confidence when you're feeling shy?' And she said, 'I'm about to take my big role, happening now".