Nagasawa Rosetsu (????, 1754–1799) was an 18th-century (Edo period) Japanese painter of the Maruyama School, known for his versatile style. He was born to the family of a low-ranking samurai. He studied with Maruyama Okyo in Kyoto.

There are conflicting versions of Rosetsu's family origins, but the most credible appears to be that he was born to the family of a low-ranking samurai named Uesugi Hikouemon in the area of modern Kyoto Prefecture. Upon establishing himself as an artist, he changed his name from Uesugi to Nagasawa. He moved to Kyoto in 1781, where he became a student of Maruyama Okyo.

Rosetsu was married and had four children, all of whom died in childhood. He adopted his pupil Nagasawa Roshu. Rosetsu, his children,...