Kosugi (written: 小杉 lit. "small Japanese cedar" or コスギ in katakana) is a Japanese surname. Notable people with the surname include:
Isamu Kosugi (小杉 勇; 1904–1983), Japanese actor and film director
Jūrōta Kosugi (小杉 十郎太; born 1957), Japanese voice actor
Kane Kosugi (ケイン・コスギ; born 1974), American karateka and actor
Ryuichi Kosugi (小杉 竜一; born 1935), Japanese comedian
Sho Kosugi (ショー・コスギ; born 1948), Japanese karateka and actor
Shunji Kosugi (小杉 俊二; born 1960), Japanese professional wrestler
Takashi Kosugi (小杉 隆; born 1935), Japanese politician
Takehisa Kosugi (小杉 武久; born 1938), Japanese classical composer
Kosugi Tengai (小杉 天外; 1865–1952), pen-name of Kosugi Tamezō, Japanese writer
Toshiyuki Kosugi (小杉 敏之; born 1968), Japanese footballer
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