Sun Suzhen (Chinese: 孫素真; 16 October 1895 – 4 April 1975) was the 18th matriarch of Yiguandao.

Sun Suzhen was born in Shan County, Shandong on the 28th day of the eighth lunar month in 1895.

She was regarded by Yiguandao's followers as the incarnation of the Yuehui "Moon Wisdom" Bodhisattva, the counterpart of Ji Gong.

[clarification needed] To this day, there are a few elders in Hong Kong who are believed to be the keepers of these heavenly mandates.

Because Yiguandao was illegal in both mainland China and Taiwan and was categorized as a cult by both authorities, she kept a low profile and was kept under seclusion.