Zheng Jiuyuan (born 13 April 2004) is a Chinese diver.
Zheng made his World Aquatics Championships debut in 2022 World Aquatics Championships and finished in eighth place in the 1 metre springboard event with a score of 365.55. He again competed at the World Championships in 2023 and won a gold medal in the team event with a score of 489.65. He also won a bronze medal in the 1 metre springboard event with a score of 418.30. In October 2023, he competed at the 2022 Asian Games and won a silver medal in the 3 metre springboard event with a score of 508.55.
Zheng competed at the 2025 World Aquatics Championships and won a gold medal in the 1 metre springboard with a score of 443.70, finishing 14.10 points ahead of silver medalist Osmar Olvera. He also won a gold medal in the 3 metre synchro with Wang Zongyuan.