Shusaku Sugiuchi (杉内 周作, Sugiuchi Shūsaku) is a Paralympic swimmer from Japan competing mainly in category S13 events.

Shusaku was a member of the Japanese swimming team at the 2004 Summer Paralympics he competed in a total of six events.

He won bronze as part of the Japanese 4 × 100 m freestyle team and finished fourth as part of the 4 × 100 m medley team.

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