Josephine Sembeyo Mancha (born 8 August 2007) is a Kenyan middle-distance runner. She won a gold medal in the 1500 metres at the 2026 World Athletics U20 Championships.

Career Sembeyo began running in 2022. In August 2026, she competed at the 2026 World Athletics U20 Championships in the 1500 metres. During the heats she finished in first with a time of 4:12.21 and advanced to the finals. During the final she won a gold medal with a time of 4:16.73.

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