Fujitani Nariakira

nihongo|Fujitani Nariakira|富士谷 成章|extra=1738-1779 was an Edo period scholar of the kokugaku tradition and one of the most eminent scholars of Japanese grammar.

He analysed Japanese poetic language and did work in periodising Japanese. He is best known for setting up four "parts of speech" in Japanese based on an analogy with clothing: "na" (names = nouns, indeclinable), "kazashi" (hairpins = particles or connectives), "yosōi" (clothing = verbs), and "ayui" (binding cords = particles and auxiliary verbs).

His work was not fully appreciated until resurrected by the grammarian Yamada Yoshio (1873-1958).