Two of the sponsorships – for the National Theater and the Association of Commonwealth Universities – were passed on to the Duchess by Harry's grandmother, Queen Elizabeth II, who has held them for 45 and 33 years respectively.
The other two are for Smart Works, which helps long-term unemployed and vulnerable women succeed in job interviews and find work, and Mayhew, a charity supporting animal welfare in London. and abroad.
The duchess will visit Smart Works later on Thursday and should appeal to the other three charities over the next few weeks, the palace said in a statement. She has held meetings and visited all four organizations during the past year, the palace announced.
"Worthy of the rights of women and their rights around the world, the Duchess will encourage more and more women to come to our centers and get the work that will transform their lives," said Juliet Hughes-Hallett, President and Founder from Smart Works. "The patronage of the Duchess will inspire the women we serve and help them reach the stars."
The support of the former actress at the National Theater reflects her belief in using the arts to unite communities and her own experience in theater and television, the palace said.
Rufus Norris, Director of the National Theater, thanked the Queen for her support and flawless service since she became her patroness in 1974.
"It is a privilege to welcome the Duchess of Sussex as a new patron." The Duchess shares our deep conviction that theater has the power to bring people from all communities and walks of life together, " did he declare.
Although she worked on television for 10 years, including on the legal theater "Suits", Meghan took a theatrical training and has already volunteered as part of an extracurricular program for disadvantaged children in Los Angeles, announced the palace.
Meghan's decision to sponsor Mayhew, which helps people in crisis, including the homeless, to keep their pets and teaches about animal welfare, also builds on her previous charitable interests.
The Duchess has supported animal rescue centers in Los Angeles, said the palace, after "long understood the connection between animals and the well-being of the community."
At the same time, the Association of Commonwealth Universities, which has over 500 member institutions in more than 50 countries, advocates for higher education as a major asset for the Commonwealth, said the palace.