Masako Chiba (千葉 真子, Chiba Masako, born 18 July 1976 in Uji, Kyoto) is a Japanese long-distance runner, who won the bronze medal in 10,000 metres at the 1997 World Championships in Athens and in the marathon race at the 2003 World Championships in Paris.

This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. (August 2021)

Chiba was a torchbearer during the 1998 Nagano Olympics Opening Ceremony.

• 5000 metres - 15:20.58 min (1997)
• 10,000 metres - 31:20.46 min (1996)
• Half marathon - 1:09:27 hrs (1999)
• Marathon - 2:21:45 hrs (2003)

• Masako Chiba at World Athletics
• marathoninfo

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