Kasumi Ishikawa is a retired Japanese table tennis player. A regular member of the Japanese national team, she won a silver medal at the 2012 Summer Olympics, a bronze at the 2016 Summer Olympics, and a silver medal at the 2020 Summer Olympics, in Women's team.

Table tennis is a racket sport derived from tennis but distinguished by its playing surface being atop a stationary table, rather than the court on which players stand. Either individually or in teams of two, players take alternating turns returning a light, hollow ball over the table's net onto the opposing half of the court using small rackets until they fail to do so, which results in a point for the opponent. Play is fast, requiring quick reaction and constant attention, and is characterized by an emphasis on spin relative to other ball sports, which can heavily affect the ball's trajectory.