Kazushi Imafuku (born 21 May 2007) is a Japanese swimmer specializing in distance freestyle. At 17 years old, Imafuku broke the Japanese national record in the 1500 metres freestyle with a time of 14:50.18. The next year, he broke the 800 metres freestyle record at Japan's high school nationals. Despite a stomach illness, he won three silver medals at the 2025 World Aquatics Junior Swimming Championships.
At the 2026 Pan Pacific Swimming Championships, Imafuku won silver in the 1500 m freestyle, reclaiming the Japanese record which had been taken by Kaito Tabuchi, lowering it to 14:42.59.
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