The decision was reached after royal officials consulted with the British government to go over protocol and precedent. Donald and Melania Trump and British Prime Minister Theresa May aren't invited as well.
The list included people from charity organisations as well as veterans from the armed forces who have suffered serious injuries in combat.
The couple have invited 600 guests with whom they have personal connections to the May 19 service at St George's Chapel.
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The couple has, however, invited more than 2,500 members of the public to the grounds of Windsor Castle to witness their wedding day.
She has made a decision to give her other ticket to grandmother Sharon Goodman, whose 15-year-old granddaughter Olivia Campbell-Hardy died in the bombing. Former soldier Philip Gillespie, 30, who lost his right leg in an IED incident in Afghanistan and takes part in the Invictus Games is also on the guest list.
The 14-year-old was born deaf and has started lunchtime lessons at his school to teach sign language and has campaigned for deaf-friendly cinema screenings.
Another is Rosie Ginday, 34, the founder of "Miss Macaroon", a charity that provides culinary training and employment opportunities for disadvantaged young people in Birmingham.
Also on the list is Amelia Thompson, 12, who was caught up in the suicide bombing at an Ariana Grande concert in Manchester that killed 22 people previous year.
The foundation, which aims to offer Mumbai women stable employment close to their homes as well as breaking taboos around menstrual hygiene by offering them access to low-priced sanitary napkins, was chosen by Markle after she saw its work "first-hand" during a visit to India previous year, the Kensington Palace said.