Masahiko is a masculine Japanese given name. Notable people with the name include:
Masahiko Amakasu (1891–1945), an officer in the Imperial Japanese Army imprisoned for his involvement in the Amakasu Incident
Masahiko Arimachi, a Japanese singer and former actor
Masahiko Fujiwara (born 1943), a Japanese mathematician best known as an essayist
Masahiko Harada (born 1968), a Japanese ski jumper
Masahiko Ichikawa (born 1985), a Japanese footballer
Masahiko Inoha (born 1985), a Japanese football player
Masahiko Kōmura (born 1942), a Japanese politician of the Liberal Democratic Party
Masahiko Katsuya (born 1960), a Japanese columnist, photographer, and pundit
Masahiko Kimura (1917–1993), a Japanese judoka (Judo practitioner)
Masahiko Kimura (bonsai artist), a bonsai master
Masahiko Kobe (born 1969), a chef specializing in Italian cuisine
Masahiko Kondō (born 1964), or Matchy is a Japanese singer, lyricist and actor
Masahiko Kumagai (born 1975), a Japanese former football player
Masahiko Minami, a Japanese anime producer and president of Bones
Masahiko Minami (academic), a linguistics professor at San Francisco State University
Masahiko Morita, a Japanese Magic: The Gathering player
Masahiko Nagasawa (born 1965), a Japanese film director
Masahiko Nakagawa (born 1969), a former Japanese football player
Masahiko Nakahira, a manga artist from Kōchi City, Japan
Masahiko Nishimura (born 1960), a Japanese theatre and film actor
Masahiko Nomi (1925–1981), a Japanese journalist who advocated Takeji Furukawa's idea
Masahiko Shibayama (born 1965), a Japanese politician of the Liberal Democratic Party
Masahiko Shimada (born 1961), a Japanese writer
Masahiko Takeshita, the head of the domestic affairs section of the Military Affairs Bureau of the Imperial Japanese Army during World War II
Masahiko Tanaka (born 1954), a voice actor
Masahiko Tsugawa, a Japanese actor and director
Masahiko Yamada (born 1942), a Japanese politician of the Democratic Party of Japan
Yuuki Masahiko, a Japanese guitarist