Marine Clémence Boyer (French: [bwa.je]; born 22 May 2000) is a French female artistic gymnast. She was a member of the bronze medal-winning team at the 2023 World Championships and was also a part of the 2018 and 2024 Europeans and 2018 Mediterranean Games silver medal winning teams and the 2016 European bronze medal winning team. Individually she is the 2018 Mediterranean Games gold medalist, the 2016 European silver medalist, the 2018 European bronze medalist and the 2024 European bronze medalist on the balance beam. She represented France at the 2016, 2020 and 2024 Summer Olympics. She is the 2016 French all-around champion and an eleven-time medalist at the FIG World Cup series.

Boyer was born on 22 May 2000 in Saint-Benoît, Réunion on the French island of Réunion to parents Alain and Rolande Boyer but grew up in Melun in metropolitan France. She began gymnastics at a club in Melun when she was five years old. In 2011, she began training at the Meaux Gymnastics club, which she still represents at domestic competitions.

Boyer won the silver medal in the all-around behind Loan His at the 2012 French Championships in the Espoir division. She made her international debut at the 2013 International Gymnix in Montreal where she placed sixteenth in the all-around and eighth in the floor exercise final in the Challenge division.

Boyer won the silver medals with the Meaux club in the team competition and in the all-around behind Loan His at the 2014 French Championships. She competed with the French team at a friendly meet against Romania and Belgium, and they finished third. Individually, Boyer finished seventh in the all-around. Then at the 2014 European Championships, the French team finished seventh, and Boyer finished thirteenth in the all-around final. At the Top Gym Tournament, Boyer tied for fifth place in the all-around with Canadian Sydney Soloski. In the event finals, she won the silver medal on the vault behind Angelina Melnikova and the gold medal on the balance beam.

At the 2015 French Championships, Boyer won the gold medal on the balance beam and the silver medal on the uneven bars behind Louise Vanhille. Then at the FIT Challenge in Ghent, she helped France win the team silver medal behind Germany, and she placed sixth in the all-around. She then competed with Juliette Bossu and Mélanie de Jesus dos Santos at the European Youth Olympic Festival in Tbilisi where they placed sixth in the team competition. Boyer qualified for the all-around final where she placed ninth, and she won the gold medal on the vault with a score of 14.275. She won a team gold medal at the Elite Gym Massilia and also placed seventh in the all-around and fourth on vault.

Boyer became age-eligible for senior competition in 2016. She made her senior international debut at the City of Jesolo Trophy and finished fourth on the balance beam with a score of 14.700, only 0.050 points behind bronze-medalist Aly Raisman. She was then selected to compete at the Olympic Test Event alongside Marine Brevet, Loan His, Anne Kuhm, Oréane Lechenault, Louise Vanhille. The team finished fourth and qualified for a team spot for the Olympic Games. She won her first World Cup title on the balance beam at the Varna World Challenge Cup. At the European Championships, she competed alongside Marine Brevet, Loan His, Oréane Lechenault, and Alison Lepin, and they won the bronze medal which was France's first European team medal since 2008. Boyer won the silver medal on the balance beam with a score of 14.600, behind Aliya Mustafina and ahead of Catalina Ponor. Then at the French Championships, she won the gold medal in the all-around and the balance beam and placed sixth on the uneven bars.

Boyer was selected to represent France at the 2016 Summer Olympics alongside Marine Brevet, Loan His, Oréane Lechenault, and Louise Vanhille. Boyer said prior to the Olympics that her goal was to qualify for a final. During the qualification round, the French team finished eleventh, and Boyer qualified for the balance beam final in seventh place with a score of 14.600. In the balance beam final, she finished fourth with a score of 14.600, only 0.133 points behind bronze medalist Simone Biles.

At the City of Jesolo Trophy, Boyer finished twelfth in the all-around and tied with Flávia Saraiva for the silver medal on the balance beam behind Riley McCusker. She then competed at the European Championships and finished sixteenth in the all-around and seventh on the balance beam. Then at the French Championships, she won the silver medal in the all-around behind Mélanie de Jesus dos Santos and the gold medals on the balance beam and the floor exercise. She won the silver medal on the balance beam at the Paris Challenge Cup behind Romanian Larisa Iordache. At the World Championships, she finished twenty-first in the all-around final. She then won the silver medal in the all-around at the Arthur Gander Memorial behind Hitomi Hatakeda. At the Swiss Cup, she competed on a mixed team with Marian Drăgulescu, and they placed eighth. Then at the Toyota International, she finished sixth on the balance beam and seventh on the floor exercise.