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箱根丸（はこねまる）は、かつて日本郵船が所有・運航したコンテナ船. 箱根丸級2隻の1番船で、同型に昭和海運との共有船「榛名丸」がある.

Hakone Maru (箱根丸) is the name of several Japanese container ships: the 1921 passenger-cargo vessel owned by Nippon Yusen, the 1968 first-generation container ship and the latest from 1983. The first of its class, it was concurrently owned by Nippon Yusen and Showa Transportation.

History
世界的な遠洋定期航路のコンテナ船化の中、日本船主では初めてのコンテナ船として、1968年8月27日三菱重工業神戸造船所で竣工した. 同年9月2日、昭和海運、マトソン社と提携したカリフォルニア航路に初就航した（1970年にマトソン社は撤退）.

Due to better handling of containers, and especially because of the fewer days needed to remain stationed at ports of call, along with the ship being faster than its contemporaries, the Hakone Maru was capable of traversing a route across the Pacific in only 30 days, compared to the 80 days it would have taken for a conventional ship of the time. The optimizations required to achieve this increase in speed were regarded to have brought about a "revolution of marine transportation".

The ship was renamed to Pacific Express and sailed as a passenger ship from South Korea to the United States, after a bigger successor ship destined to be employed on a route to California was built on 12 December 1978.

On 19 March 1980, the ship was sold to South Korea, where it was finally dismantled around 1986.