Ketsumeishi (ケツメイシ) is a four-member Japanese pop and hip hop group that incorporates singing and rapping into their music. They have had several major hits in Japan, including "Sakura", which reached number two on the Oricon yearly chart for 2005 and was featured in the Japanese game Taiko no Tatsujin. Ketsumeishi is a Japanese word for a type of medical herbs made from the seeds of Senna obtusifolia, which is often used in Chinese medicine.

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• Ryo Tanaka (田中 亮, Tanaka Ryō): Vocalist
• Ryoji Otsuka (大塚 亮二, Ōtsuka Ryōji): Vocalist
• Daizo Yoshida (吉田 大蔵, Yoshida Daizō): Vocalist
• Kenta Kohno (河野 健太, Kōno Kenta): DJ