| Nagase Masaki | |
| Native Name: | 長瀬 真幸 |
| Birth Date: | 1765 |
| Death Date: | June 23, 1835 |
| Nationality: | Japanese |
was a scholar of Japanese literature, kokugakusha, and samurai retainer of the Kumamoto Domain. His common name was, and he also used the noms de plume and .
The young Nagase Masaki studied under the Confucian scholar . His father,, taught him about the etiquette, language, and practices of the kuge. From, a Shinto priest associated with a branch of Usa Jingū, Masaki learned about the Shinto tradition handed down by the Tachibana lineage.[1]
Masaki travelled to Edo and is known to have collaborated with Hanawa Hokiichi.[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". He had a number of students, including and Hayashi Ōen.[3]