Nicholas James McKim is an Australian politician, currently a member of the Australian Senate representing Tasmania. He was previously a Tasmanian Greens member of the Tasmanian House of Assembly elected at the 2002 election, representing the Franklin electorate from 2002 to 2015, and led the party from 2008 until 2014. On 21 April 2010, he became the first member of the Greens in any Australian ministry. From February 2020 until June 2022, he served as co-deputy leader of the Australian Greens.

Starting in July 2017, the eligibility of several members of the Parliament of Australia was questioned. Referred to by some as a "constitutional crisis", fifteen sitting politicians were ruled ineligible by the High Court of Australia or resigned pre-emptively. The situation arose from section 44(i) of the Australian Constitution, which prohibits parliamentarians from having allegiance to a foreign power, especially citizenship. On that basis, the High Court had previously held that dual citizens are ineligible for election unless they have taken "reasonable steps" to renounce the foreign citizenship before nomination.