长瀞町（日语：长瀞町／ながとろまち）是埼玉县秩父郡的一个人口约8千人的町。

Nagatoro(長瀞町,Nagatoro-machi) is a town located in Chichibu District, Saitama Prefecture, in the central Kantō region of Japan. As of 1 February 2016, the town had an estimated population of 7,281 and a population density of 244 persons per km². Its total area was 30.43 square kilometres (11.75 sq mi). The Nagatoro River is well known for its rapids and whitewater rafting and boating, and the entire town is designated as a prefectural nature park and preserve.