Nezumi no Sumō (ねずみのすもう or ねずみの相撲, lit. "Rat's/Mouse's Sumo") is a Japanese folk tale. It tells the story of an old man and his wife who help out some mice who engage in sumo. As a reward, one of the mice gives them enough gold on which to live for the rest of their lives.

Studio Ghibli released a 13-minute short film in 2010 titled Chūzumō based on this folk tale. The film shows at the Ghibli Museum in Mitaka.