Yoshinaga is both a Japanese surname and a masculine Japanese given name. Notable people with the name include:
Ōuchi Yoshinaga (1532–1557), 16th century Kyushu warriorAsano Yoshinaga (1576–1613), Japanese samurai and feudal lord of the late Sengoku and early Edo periodFumi Yoshinaga (born 1971), Japanese manga artist, known for her shōjo and shōnen-ai worksMatsudaira Yoshinaga (1828–1890), the 14th head of Fukui Domain during the Late Tokugawa shogunate and politician of the Meiji eraSayuri Yoshinaga (born 1945), Japanese actressYoshinaga Fujita, award winning novelist and screenwriter from JapanFictional characters:
Miyuki Yoshinaga, human guise of the Orchid Undead from Kamen Rider Blade