Nagase Masaki (長瀬 真幸, 1765–1835) was a scholar of Japanese literature, kokugakusha, and samurai retainer of the Kumamoto Domain.
His common name was Shichirōhei (七郎平), and he also used the noms de plume Tabuse (田廬) and Sōmatsu'en (双松園).
The young Nagase Masaki studied under the Confucian scholar Kusano Senkei (草野 潜渓).
His father, Nagase Masatsune (長瀬 正常), taught him about the etiquette, language, and practices of the kuge.
[2] Masaki believed that "kokugaku is the research and clarification of the ancient lexicon and the events of antiquity, and through this study rediscovering the Age of the Gods".