Nippon Maru (日本丸) is a Japanese training sailing ship operated by the National Institute for Sea Training out of Tokyo.^[1] She was built by Sumitomo Heavy Industries in Uraga, Kanagawa, and was launched on 15 February 1984, with her commissioning occurring on 16 September.^[1] She was built as a replacement for the 1930-built barque Nippon Maru.^[1]

Nippon Maru is 110.1 metres (361 ft) long, with a beam of 13.8 metres (45 ft) and a draft of 6.5 metres (21 ft).^[1] Her gross tonnage is 2,891.^[1] She is rigged as a four-masted barque, with a sail area of 2,760 square metres (29,700 sq ft), and has two 1,500-horsepower diesel engines for auxiliary functions.^[1] She has a crew complement of 70, with a training complement of 120 trainees.^[1]