Junko Onishi (大西 順子, Onishi Junko, born October 18, 1974 in Hyōgo) is a former butterfly swimmer from Japan, who won the bronze medal in the 4 × 100 m medley relay at the 2000 Summer Olympics in Sydney, Australia.

Her winning teammates in that race were Mai Nakamura, Masami Tanaka, and Sumika Minamoto.

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