Nathaniel Erskine-Smith MP (born June 15, 1984) is a Canadian politician. A member of the Liberal Party, he is a Member of Parliament, representing Beaches-East York. Erskine-Smith became the youngest MP to be elected in the Greater Toronto Area on October 19, 2015, after a successful grassroots open nomination in December 2014. He successfully retained his seat in the 2019 federal election.

Erskine-Smith sits on the Standing Committee on Industry, Science and Technology. He also occupies an executive role on the committee of the Canadian Group of the Inter-Parliamentary Union (IPU) as a past president. Prior to entering politics, Erskine-Smith was a lawyer at a commercial litigation firm downtown Toronto. He supplemented his practice with volunteer legal work for a range of clients and causes, which included fighting public interest matters in court, and research for the Canadian Civil Liberties Association.
Erskine-Smith hosts a weekly podcast series, titled Uncommons: Canadian Politics with Nathaniel Erskine-Smith, in which he seeks out experts from his work and travels in Ottawa and Toronto to discuss on topics in the news and general matters of interest to the public.