Kaisei may refer to:

• Kaisei (ship), the STS Kaisei
• Kaisei, Kanagawa, a town in Japan
• Kaisei Academy, a Japanese boys' school

• Kaisei Ichirō (魁聖 一郎), retired Japanese Brazilian professional sumo wrestler
• Kaisei Ishii (石井 快征, born 2000), Japanese footballer

• Project Kaisei, a mission to clean up the Great Pacific garbage patch

This disambiguation page lists articles associated with the title Kaisei.
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