Gary Shiu (Chinese: 蕭文禮) is a Chinese-American theoretical physicist who is a professor of physics at the University of Wisconsin-Madison.

His research spans cosmology, particle physics, and string theory.

He has made significant contributions to both fundamental and phenomenological aspects of string theory.

[1] Gary Shiu received his primary and secondary school education at St Joseph's College.

[14] He was an invited speaker of the inaugural International Congress of Basic Science in 2023.