Seiji (written: 誠二, 誠治, 誠史, 誠司, 誠次, 清二, 清治, 清次, 聖二, 聖治, 聖司, 征二, 征治, 征爾, 成二, 精二, 菁児, 菁滋, 静児, 政二 or せいじ in hiragana) is a masculine Japanese given name. Notable people with the name include:
Seiji Aochi (青地 清二) (1942–2008), Japanese ski jumper
Seiji Ara (荒 聖治) (born 1974), Japanese racing driver
Seiji Chiba (千葉 誠治) (born 1964), Japanese film director and producer
Seiji Ebihara (海老原 清治) (born 1949), Japanese golfer
Seiji Hagiwara (萩原 誠司) (born 1956), Japanese politician
Seiji Hirao (平尾 誠二) (born 1963), Japanese rugby union player
Seiji Hisamatsu (久松 静児) (1912–1990), Japanese film director
Seiji Honda (本田 征治) (born 1976), Japanese footballer
Seiji Inagaki (born 1973), Japanese hurdler
Seiji Kameda (亀田 誠治) (born 1964), Japanese musician and record producer
Seiji Kaneko (金古 聖司) (born 1980), Japanese footballer
Seiji Kihara (木原 誠二) (born 1970), Japanese politician
Seiji Koga (古賀 誠史) (born 1979), Japanese footballer
Seiji Kishi (岸 誠二), Japanese anime director
Seiji Kubo (born 1973), Japanese footballer
Seiji Kumagai (熊谷 誠二) (born 1967), Japanese voice actor
Seiji Kurata (倉田 精二) (born 1945), Japanese photographer
Seiji Maehara (前原 誠司) (born 1962), Japanese politician
Seiji Mataichi (又市 征治) (born 1944), Japanese politician
Seiji Matsuyama (松山 せいじ) (born 1975), Japanese manga artist
Seiji Miyaguchi (宮口 精二) (1913–1985), Japanese actor
Seiji Mizushima (水島 精二) (born 1966), Japanese anime director
Seiji Morita (森田 清次), Japanese film editor
Seiji Nakamura (仲村 正治) (born 1931), Japanese politician
Seiji Nemoto (根本 誠次) (born 1961), Japanese sport wrestler
Seiji Ogawa (小川 誠二) (born 1934), Japanese biologist
Seiji Oko (大古 誠司) (born 1948), Japanese volleyball player
Seiji Ono, Japanese table tennis player
Seiji Osaka (逢坂 誠二) (born 1959), Japanese politician
Seiji Ozawa (小澤 征爾) (born 1935), Japanese conductor
Seiji Sakaguchi (坂口 征二) (born 1942), Japanese professional wrestler
Seiji Sasaki (佐々木 誠二) (born 1965), Japanese voice actor
Seiji Shibata (柴田 征二) (born 1938), Japanese fencer
Seiji Shinkai (新海 征治) (born 1944), Japanese chemist
Seiji Suzuki (鈴木 政二) (born 1948), Japanese politician
Seiji Takahashi (高橋 聖二) (born 1993), Japanese ice hockey player
Seiji Takaiwa (高岩 成二) (born 1968), Japanese actor
Seiji Takaku, Japanese psychologist
Seiji Takeda (竹田 菁滋) (born 1960), Japanese television producer
Seiji Tōgō (東郷 青児) (1897–1978), Japanese painter and artist
Seiji Ueda (上田 清二) (born 1952), Japanese astronomer
Seiji Yamada (山田 誠司) (born 1966), Japanese ski mountaineer
Seiji Yokoyama (横山 菁児) (born 1935), Japanese composer
See also: Seiji (青磁) for celadon wares
