Lau Siukai (Chinese: 劉兆佳) (born 1947), GBS, is a sociologist from Hong Kong.

During his tenure at CUHK he was also associate director of the university's Hong Kong Institute of Asia-Pacific Studies.

He is also a former vice president of the Chinese Association of Hong Kong and Macao Studies, Beijing's top think tank on Hong Kong affairs,[1] and continues to hold a consultant role in that organization as of November 2023[update].

In this role, he famously under-predicted attendance on the 1 July 2003 protest march at '30,000', when in fact more than 500,000 joined to reject the planned introduction of legislation to enact Article 23 of the Basic Law, along with other grievances, ultimately leading to the resignation of Chief Executive Tung Chee Hwa.

[5] In January 2021, Lau said that only "patriots who love Hong Kong" and are supportive of the government should be able to run in elections.