Yosakoi (よさこい) is a unique style of dance that originated in Japan. Yosakoi started in the city of Kōchi in 1954, as a modern rendition of Awa Odori, a traditional summer dance. Yosakoi-style dancing has spread throughout much of Japan. The style of dance is highly energetic, combining traditional Japanese dance movements with modern music. The choreographed dances are often performed by large teams. Along with a number of professional yosakoi schools and town dance teams, yosakoi is also a popular event during the sports festivals held by Japanese elementary, junior, and senior high schools. Yosakoi participants include men and women of almost all ages – sometimes within a single team.

The costumes used by yosakoi teams vary widely. Happi coats and yukata are the most predominant costumes and can be seen in a wide variety of colors. However, some groups choose costumes that are based on historical attire, popular fashions, or ethnic fashions. Typically, all members of a team wear similar costumes.

One of the defining aspects of yosakoi dance is the use of naruko: small wooden clappers that are held in the hands of each dancer. Naruko were originally used in Kōchi Prefecture to scare birds away from rice fields. The traditional naruko has black and yellow beaters on a wooden body, but most modern yosakoi groups create their own naruko, choosing colors and materials that match their costumes. The use of naruko is required in yosakoi dance, but many groups also use other hand-held instruments or props, such as drums, other percussion instruments, flags, batons, and floats.