The 24-year-old royal, who enrolled at the English university back in 2014, earned her master’s in an incognito fashion.
Similarly to her year abroad, the Princess maintained a low-key profile at the graduation ceremony, lining up with her peers and removing the royal title - Her Imperial Highness Princess Mako of Akishino - from her name.
The princess was one of 35 students in the program and has previously said she had a "great experience" during her time at the university.
Mako lived among students in a hall of residence, and even did a work placement at Leicester’s New Walk Museum.
During a press conference the Japanese royal spoke in her native tongue about her time abroad.
“I would like to express my sincere gratitude for having had the opportunity to pursue my studies in such a favourable environment. It has been a very fruitful year for me. I hope to apply what I have learned at postgraduate school in the future."
"We are delighted that Princess Mako decided to return to Leicester to receive her degree in person and also attend a reception for graduates in our school." Suzanne Macleod, the university's museum studies department head, said.
Adding, "She has been a pleasure to teach, has worked incredibly hard and should be very proud of her achievements."