Geng Tan (simplified Chinese: 谭耕; traditional Chinese: 譚耕; pinyin: Tán Gēng; born 1963) is a Canadian engineer and former politician who served as the member of Parliament (MP) for Don Valley North from 2015 to 2019.

[1][2] Tan worked at Atomic Energy of Canada Limited (AECL) and Ontario Power Generation (OPG) as a nuclear scientist.

[4] According to a Canadian Security Intelligence Service report described by Global News intelligence sources, Tan was prepared to accept a 2018 invitation to travel to Taiwan, but was persuaded not to do so by Liberal MPPs Michael Chan and Han Dong.

[6] On June 25, 2019, the National Post broke the news in English-language media and reported that a former constituency staffer had accused him of refusing to pay child support for a child fathered via in vitro fertilization while they were in a relationship.

Tan denied the accusations, saying that he had only consented to donating sperm to her, and said he would fight the case in court.