Ryōgoku Kokugikan , also known as Ryōgoku Sumo Hall or Kokugikan Arena, is the name bestowed to two different indoor sporting arenas located in Tokyo. The first Ryōgoku Kokugikan opened its doors in 1909 and was located on the premises of the Ekōin temple in Ryōgoku, Tokyo. Although no sumo bouts were held after 1945, following the capitulation of Japan and the requisition of the building by the occupying forces, the building itself remained active until 1983, being notably used by the Nihon University. The second Ryōgoku Kokugikan is currently located in the Yokoami neighborhood of Sumida next to the Edo-Tokyo Museum. It opened in 1985, following the closure of the Kuramae Kokugikan, and is still in use today.

Sumo is a form of competitive full-contact wrestling where a rikishi (wrestler) attempts to force his opponent out of a circular ring (dohyō) or into touching the ground with any body part other than the soles of his feet.