The Keiyō Line is a railway line connecting Tokyo and Chiba in Japan, paralleling the edge of Tokyo Bay. It is operated by the East Japan Railway Company. The line forms part of what JR East refers to as the "Tokyo Mega Loop" (東京メガループ) around Tokyo, consisting of the Keiyō Line, Musashino Line, Nambu Line, and Yokohama Line. It provides the main rail access to Tokyo Disney Resort and the Makuhari Messe exhibition center.

The Tokyo Disney Resort is a theme park and vacation resort located in Urayasu, Chiba, Japan, just east of Tokyo. The resort is fully owned and operated by The Oriental Land Company under a licence from The Walt Disney Company, which constructed and designed the resort and its various attractions.