Kannai (関内) is a district in Naka Ward, Yokohama, Japan, bounded by the Ōoka River, JR Negishi Line, Nakamura River, and Yokohama waterfront. "Kannai" is not an official name of the area, but the common term of reference has been in use for over a century.
Kannai is the heart of administrative and commercial Yokohama, with the Kanagawa Prefectural Government offices, the Yokohama Municipal Government offices, Kanagawa Prefectural Police Headquarters, other governmental offices as well as major business offices within its borders.
Kannai encompasses the old districts of Bashamichi, Chinatown, and Yamashita Park, making Kannai a major tourist destination in Yokohama, rivaling the adjacent Minato Mirai 21.