The Sumo Museum (相撲博物館, sumō hakubutsukan) is an institution located in the Ryōgoku Kokugikan arena in Sumida, Tokyo.

Its missions are to prevent the loss of materials related to sumo by collecting them and displaying them in the premises of the museum.

The museum collects materials related to sumo (such as woodblock prints, banzuke and keshō-mawashi) and display them to the public.

It also functions as a research center to study and examine the history of sumo and holds public conferences (called "Master talk event") where former wrestlers reflects on their career and answer questions from fans.

In January 2020, the Sumo Museum closed its door in the process of a renovation plan and in prevision of the 35th anniversary of the Ryōgoku Kokugikan.