A by-election for the seat of Wanguri in the Northern Territory Legislative Assembly was held on 16 February 2013. The by-election was triggered by the resignation of Australian Labor Party (ALP) member and former Chief Minister of the Northern Territory Paul Henderson on 25 January 2013, following the defeat of Henderson's government at the 2012 territory election.
Nominations for the by-election closed on 1 February 2013. Rhianna Harker, who contested Wanguri at the 2012 general election, was endorsed by the Country Liberal Party as its candidate. The Australian Labor Party candidate was Nicole Manison. Peter Rudge contested the by-election as an independent candidate—he had previously stood as a candidate for Nightcliff in the 2012 election.