Cai Zelin (simplified Chinese: 蔡泽林; traditional Chinese: 蔡澤林; pinyin: Cài Zélín, born 11 April 1991, in Huize, Yunnan) is a Chinese male racewalker.

[1] He finished 4th at the 20 km walk during the 2012 London Olympics, and won the silver medal at the 2016 Rio Olympics.

[2] He finished 5th at the 2015 World Championships in the 20 km race walk.

[2] In 2019, he competed in the men's 20 kilometres walk at the 2019 World Athletics Championships held in Doha, Qatar.

This biographical article relating to People's Republic of China athletics is a stub.