The Odakyu Group is a group of companies centered around the Odakyu Electric Railway company based in Shinjuku, Tokyo, Japan. The group originated as a rail transport operator, but has since diversified its operations to include real estate, retail, B2B, finance, fiber optic networking, personal storage, travel sales, and bus services. It also owns several recreational facilities, including a golf course, campground, hot springs resort, and sailing resort, all of which are situated to bring more passengers onto the core business, the railway network. As of 2025, the group comprises 67 companies. All are separate companies and retain their own branding and logos, albeit with coordination among group companies and cross ownership. Not all member companies use the name Odakyu, though many do.