The Odakyu Odawara Line is the main line of Japanese private railway operator Odakyu Electric Railway. It extends 82.5 km (51.3 mi) from Shinjuku in central Tokyo through the southwest suburbs to the city of Odawara, the gateway to Hakone in Kanagawa Prefecture. It is a busy commuter line and is also known for its "Romancecar" limited express services. From Yoyogi-Uehara Station some trains continue onto the Tokyo Metro Chiyoda Line and beyond to the East Japan Railway Company Joban Line.

The Odakyu Electric Railway Company, Ltd. , commonly known as Odakyū or Odawara Kyuko, is a major railway company based in Tokyo, Japan, best known for its Romancecar series of limited express trains from Tokyo to Odawara, Enoshima, Tama New Town, and Hakone.