Kenneth Sim (Chinese: 沈觀健; Cantonese Yale: Sám Gūn-gihn; born October 18, 1970) is a Canadian politician and businessman who has served as the 41st mayor of Vancouver since 2022.

Born in Vancouver to Hong Kong immigrants Francis Sim (d. 1999) and Maria Theresa Kim (1932–2016), Sim attended Magee Secondary School, Sir Winston Churchill Secondary School, and the UBC Sauder School of Business, graduating with a BComm in finance in 1993. He also holds a FCPA and FCA accounting designation.

Sim co-founded Nurse Next Door Home Healthcare Services in 2001.

Sim first ran for mayor of Vancouver with the Non-Partisan Association in the 2018 Vancouver municipal election and finished the runner-up to Kennedy Stewart.

Sim was elected mayor of Vancouver, running under the ABC Vancouver party banner, on October 15, 2022. He is the first challenger to defeat a sitting mayor of Vancouver since 1980, when Mike Harcourt upset incumbent Jack Volrich. Sim is the first Chinese Canadian elected Mayor of Vancouver.

In 2023, The Globe and Mail published allegations from an anonymous Canadian Security Intelligence Service source claiming that China interfered in the 2022 Vancouver municipal election. Sim has denounced the insinuations made in the article about himself and election interference, stating "If there's proof of foreign interference in our election, I want to know about it because I'm a Canadian … but right now there are a bunch of insinuations."

Sim was criticised by members of the Green Party for converting a boardroom at Vancouver City Hall into a personal gym.

In March 2023, during Sim's mayoral term, a homeless count was commenced by the Homelessness Services Association of BC, the first since the beginning of the pandemic. The results of the count were released in October 2023. A local non-profit serving the population expects the results to show increases given their increased demand for services.