Tadashi (Kanji: 正, 禎, Hiragana: ただし), Japanese masculine name, may refer to :
- Tadashi (Band) Rock band from Chicago, IL
- Tadashi Abe (1926-1984), the first aikido master to live and teach in the west
- Tadashi Abe (astronomer), (1943-), amateur astronomer and high school teacher
- Tadashi Agi (1962-), Japanese manga storywriter, novelist and screenwriter,
- Tadashi Hattori (1908-2008), a Japanese composer,
- Masashi Hirose
- Tadashi Ikegami, a Japanese video game music composer,
- Tadashi Inuzuka
- Tadashi Irie, a Japanese yakuza boss
- Tadashi Ishimine, baseball catcher for the Tohoku Rakuten Golden Eagles
- Tadashi Izawa (1895-1990)
- Tadashi Kawamata, a Japanese plasticist,
- Tadashi Kuranari (1918-1996),
- Tadashi Mori (1921-1987)
- Tadashi Nakamura (1942-), the founder of Seido Juku Karate
- Tadashi Ohtsuka (1978-),
- Tadashi Sasaki
- Tadashi Sato
- Tadashi Sawamura (1943-),
- Tadashi Shimada (1949-)
- Shoji Tadashi, fashion designer
- Tadashi Suetsugi, a Japanese Engineer,
- Tadashi Suzuki, a theatrical director, writer,
- Tadashi Takamura (1933-)
- Tadashi Wakabayashi
- Tadashi Yamaneko, a contemporary Japanese artist,
- Tadashi Yamashita (1942-), American martial artist,
- Tadashi Yanai (1949-)
- Tadashi Yokouchi
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