Tatsuo (written: 龍夫, 龍雄, 龍生, 龍男, 竜夫, 竜雄, 竜男, 達夫, 達雄, 達生, 達男, 達郎, 辰夫, 辰雄, 立郎 or 剛男) is a masculine Japanese given name. Notable people with the name include:
Tatsuo Endo (遠藤 達雄) (1925–1989), Japanese engineer
Tatsuo Fujimoto (藤本 達夫) (born 1940), Japanese swimmer
Tatsuo Hasegawa (長谷川 龍雄) (1916–2008), Japanese automotive engineer
Tatsuo Hirano (平野 達男) (born 1954), Japanese politician
Tatsuo Hori (堀 辰雄) (1904–1953), Japanese writer, poet and translator
Tatsuo Inagaki (born 1962), Japanese artist
Tatsuo Itoh, American academic
Tatsuo Jihira (地平 達郎) (born 1948), Japanese water polo player
Tatsuo Kainaka (甲斐中 辰夫) (born 1940), Japanese judge
Tatsuo Kamon (嘉門 達夫) (born 1959), Japanese singer-songwriter
Tatsuo Kawabata (川端 達夫) (born 1945), Japanese politician
Tatsuo Kawai (河相 達夫) (1889–1965), Japanese diplomat and writer
Tatsuo Kinoshita (木下 達生) (born 1987), Japanese baseball player
Tatsuo Kobayashi (小林 龍生) (born 1951), Japanese computer scientist
Tatsuo Kondō (近藤 龍夫) (1916–1992), Japanese photographer
Nagai Tatsuo (永井 龍男) (1904–1990), Japanese writer
Nishida Tatsuo (西田 龍雄) (1928–2012), Japanese linguist
Tatsuo Sasaki (佐々木 竜雄) (born 1942), Japanese sport wrestler
Tatsuo Satō (director) (佐藤 竜雄) (born 1964), Japanese anime director
Tatsuo Sato (politician) (佐藤 剛男) (born 1937), Japanese politician
Tatsuo Shimabuku (島袋 龍夫) (1908–1975), Japanese karateka
Tatsuo Suzuki (鈴木 達夫) (born 1935), Japanese cinematographer
Tatsuo Utagawa (宇田川 竜男) (born 1917), Japanese ornithologist and academic
Tatsuo Watanabe (渡部 龍雄) (born 1928), Japanese ski jumper
Tatsuo Yada (矢田 立郎) (born 1940), Japanese politician
Tatsuo Yamada (山田 辰夫) (born 1956), Japanese actor
Yamamoto Tatsuo (politician) (山本 達雄) (1856–1947), Japanese politician
Tatsuo Yoshida (吉田 竜夫) (1932–1977), Japanese illustrator and character designer
