Toshinari is a masculine Japanese given name. Notable people with the name include:
Toshinari Maeda, Japanese general
Fujiwara Toshinari, better known as Fujiwara no Shunzei, poet and nobleman of ancient Japan
Fujiwara Toshinari no Musume, Shunzei's granddaughter and noted poet
Prince Toshinari (b. 1844, d. 1872 CE), eighth son of Fushimi-no-miya Kuniye, who founded a branch of the Imperial Household of Japan
Toshinari Suwa, member of the men's marathon team for Japan in the 2004 Summer Olympics