Marianne Tso Wong Man-yin BBS FRSC (born 30 October 1944, Beijing) is a Hong Kong chemist.

Graduated from the Chinese University of Hong Kong, she obtained her master's degree at the University of Miami and doctoral degree at the University of Wisconsin-Madison. She continued her post-doctoral study at the Stanford University Medical Center. She is a fellow of the Royal Society of Chemistry and worked as the director of the Radioisotope Unit at the University of Hong Kong.^[1]

She was also the member of the Provisional Legislative Council (1996–98), member of the Chinese People's Political Consultative Conference National Committee and the executive committee member of the pro-Beijing political party Democratic Alliance for the Betterment and Progress of Hong Kong.^[2]

Her husband, Tso Wung-Wai, is also a well-known chemist and politician.