Jun Ke Choy (Chinese: 蔡增基; pinyin: Cài Zēngjī; Wade–Giles: Tsai Tseng-chi; 1892 – July 9, 1981) was a Chinese American politician who served as mayor of Hangzhou and the 14th chairman of the China Merchants Steamship Company Group, now known as China Merchants Group. He was also the founder of the Chinese Culture Center in San Francisco. Choy is commonly known as J.K. Choy.