Masayuki (written: 正之, 正行, 正幸, 昌之, 昌行, 昌幸, 昌由, 政之, 政行, 雅之, 雅行, 真幸, 眞幸, 征之 or 将之) is a masculine Japanese given name and may refer to:
- Masayuki Deai (出合 正幸?) (born 1981), Japanese actor
- Masayuki Fujio (藤尾 正行?) (1917–2006), Japanese politician
- Masayuki Hisataka (久高 正之?) (born 1940), Japanese karateka
- Hanabusa Masayuki (花房 正幸?) (1524–1605), Japanese samurai
- Hoshina Masayuki (保科 正之?) (1611–1673), Japanese daimyō
- Masayuki Hyokai (氷海 正行?) (born 1950), Japanese handball player
- Masayuki Iwamoto (岩本 雅之?), Japanese astronomer
- Masayuki Izumikawa (泉川 正幸?) (born 1971), Japanese volleyball player
- Masayuki Kato, Japanese businessman
- Masayuki Kawamura (河村 正之?) (1878–1933), Japanese physician
- Masayuki Kawamura (golfer) (born 1967), Japanese golfer
- Masayuki Kikuchi (菊地 正幸?) (1948–2003), Japanese seismologist
- Masayuki Kishida (岸田 真幸?) (born 1985), Japanese swimmer
- Masayuki Kojima (小島 正幸?) (born 1961), Japanese animator and anime director
- Masayuki Kono (河野 真幸?) (born 1980), Japanese professional wrestler and mixed martial artist
- Masayuki Maegawa (born 1984), Japanese footballer
- Masayuki Matsubara (松原 正之?) (born 1939), Japanese sport wrestler
- Masayuki Matsunaga (松永 政行?) (born 1970), Japanese gymnast
- Masayuki Minami (南 将之?) (1941–2000), Japanese volleyball player
- Masayuki Mita (見田 雅之?) (born 1969), Japanese footballer
- Masayuki Miyaji (宮地 昌幸?) (born 1976), Japanese anime director
- Masayuki Miyata (宮田 雅之?) (1926–1997), Japanese artist
- Mitoizumi Masayuki (水戸泉 眞幸?) (born 1962), Japaneses sumo wrestler
- Masayuki Mori (actor) (森 雅之?) (1911–1973), Japanese actor
- Masayuki Mori (film producer) (森 昌行?) (born 1953), Japanese film producer
- Masayuki Nagare (流 政之?) (born 1923), Japanese sculptor
- Masayuki Nakagomi (中込 正行?) (born 1967), Japanese footballer
- Masayuki Naoshima (直嶋 正行?) (born 1945), Japanese politician
- Masayuki Naruse (成瀬 昌由?), Japanese professional wrestler
- Masayuki Ochiai (落合 正幸?), Japanese film director
- Masayuki Ochiai (footballer) (落合 正幸?) (born 1981), Japanese footballer
- Masayuki Okano (岡野 雅行?) (born 1972), Japanese footballer
- Masayuki Omori (大森 征之?) (born 1976), Japanese footballer
- Masayuki Onishi (大西 昌之?) (born 1977), Japanese footballer
- Masayuki Ota (太田 雅之?) (born 1973), Japanese footballer
- Masayuki Sakoi (迫井 政行?) (born 1974), Japanese anime director
- Sanada Masayuki (真田 昌幸?) (1540s – 1611), Japanese daimyō
- Masayuki Sano (佐野 雅之?) (born 1919), Japanese fencer
- Masayuki Suo (周防 正行?) (born 1956), Japanese film director
- Masayuki Suzuki (鈴木 雅之?) (born 1956), Japanese singer
- Masayuki Suzuki (drummer) (鈴木 政行?) (born 1972), Japanese drummer
- Masayuki Takagi (高木 雅行?), Japanese film producer
- Masayuki Takayanagi (高柳 昌行?) (1932–1991), Japanese musician
- Masayuki Tanaka (田中 雅之?) (born 1951), Japanese singer
- Masayuki Tani (谷 正之?) (1899–1962), Japanese politician
- Tochihikari Masayuki (栃光 正之?) (1933–1977), Japanese sumo wrestler
- Masayuki Uemura (上村 雅之?) (born 1943), Japanese video game hardware designer
- Masayuki Yanagisawa (柳沢 将之?) (born 1979), Japanese footballer
- Masayuki Yanai (箭内 政之?) (born 1959), Japanese astronomer