Mamoru (まもる, マモル) is a Japanese given name. Notable people with the name include:
Marcus Mamoru Toji (born 1984), American actor
Mamoru Fujieda (born 1955), Japanese composer
Mamoru Fujisawa or Joe Hisaishi (born 1950), Japanese composer best known for his work with animator Hayao Miyazaki
Mamoru Hosoda (born 1967) Japanese film director
Mamoru Imura (born 1948), Japanese inventor, music composer, and Chief Executive Officer of VitaCraft and VitaCraft Japan
Mamoru Miyano (born 1983), Japanese actor and voice actor
Mamoru Mohri (born 1948), Japanese astronaut
Mamoru Nagano (born 1960), Japanese animator and character designer
Mamoru Oshii (born 1951), Japanese film director
Mamoru Samuragochi (born 1963), Japanese impostor
Mamoru Sato (born 1937), American modernist sculptor
Mamoru Shigemitsu (1887–1957), Japanese Minister of Foreign affairs at the end of World War II
Mamoru Takuma (1963–2004), Japanese criminal/murderer
Mamoru Inagaki, Olympics marksmen
Mamoru Sugiura, Japanese illustrator/manga artist
Mamoru Hamatsu, anime director
Fictional characters:
Mamoru, in the GBA video game "Mega Man Battle Network 3 Blue/White"
Mamoru Akasaka a character in Higurashi no Naku Koro ni visual novel and anime series
Mamoru Chiba, a character in the Sailor Moon series
Mamoru Endo, a character in the Inazuma Eleven
Mamoru Itsuki, a character in Forbidden Siren
Mamoru Izawa, a character in the Captain Tsubasa series
Mamoru Kagemori, a character in Kage Kara Mamoru!
Mamoru Takamura, a character in the Fighting Spirit (はじめの一歩, Hajime no Ippo) series
Mamoru Yoshimura, a character in Mamoru-kun ni Megami no Shukufuku wo!
Mamoru Itou, a character in From the New World
Mamoru-kun, the anthropomorphic canine mascot for Fukuoka Prefecture's disaster prevention, created by CyberConnect2. Mamoru-kun was originally planned to be the main character of Tail Concerto II, but due to the poor sales of the last game, it never came to fruition.