The 2023 Arafura by-election was held on Saturday, 18 March 2023 to elect the next member of the Northern Territory Legislative Assembly for the electoral division of Arafura. The by-election was triggered by the death of incumbent Labor MP Lawrence Costa, who died on 17 December 2022 and had a state funeral held for him on 1 March. The election was won by Labor candidate Manuel Brown. Chief Minister and NT Labor leader Natasha Fyles declared victory after two hours of counting.