Kensington Palace made the announcement on Thursday, explaining that these charities were chosen to "reflect the causes and issues with which [Meghan] has always been associated including the arts, access to education, support for women and animal welfare".
She's also become patron of Smart Works and Mayhew, with the former being an organisation that helps long-term unemployed and vulnerable women regain the skills, while the latter is an animal welfare charity.
The role was previously filled by the Queen, who is also passing on her patronage to The Association of Commonwealth Universities to her new granddaughter-in-law.
The Queen has held her role with the National Theatre for 45 years and after 33 years, the monarch is also handing over her role with The Association of Commonwealth Universities to Meghan.
However, she trained in theatre and said she felt she could use her position to "focus attention on and make a particular difference to the sector".
WPA Pool via Getty ImagesThe duchess picks out a bracelet during her visit to Smart Works.
Dressing her growing baby bump in a black stretch maternity midi dress by Hatch and an Oscar de la Renta sand coat, Meghan was all smiles as she joined in on a discussion with volunteers and women who have been helped succeed in job interviews.
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The charity tweeted about its new patron: "The duchess's decision to support Smart Works reflects her passion in supporting women, and her commitment will help women in need across the United Kingdom".
To date the charity has helped over 11,000 women and aims to dress 3,500 women this year across their two London offices, and additional bases in key cities across the UK - Edinburgh, Manchester, Reading, Birmingham and Newcastle.
The duchess has had private visits with the organisations throughout previous year, according to the press release.
Patronages are often life-long commitments, with the chosen royal having a strong interest in the subject matter.
The anecdote may come as a surprise to many, especially given that Meghan has become a global style icon. "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".
"It is a privilege to welcome the Duchess of Sussex as our new patron".
"She has done so much research".