Jiang Chengji (born 25 November 1975) (simplified Chinese: 蒋丞稷; traditional Chinese: 蔣丞稷; pinyin: Jiǎng Chéngjì; born November 25, 1975, in Shanghai) is an international male Chinese butterfly, breaststroke and freestyle swimmer from Shanghai.

He competed at the 1996 Summer Olympics in the 100 m butterfly, finishing fourth, 0.07 seconds behind the bronze medal winner.

Jiang also participated for China in 2000 Summer Olympics in the 50 m freestyle but failed to pass into the later stages, finishing tied 17th, 0.02 seconds outside the time needed to qualify for the semifinals.

Jiang finished third at the 2004–05 FINA Swimming World Cup in the men's freestyle.

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