Urzainqui (also known as Urzainki) is a town and municipality in the province and autonomous community of Navarre, in northern Spain. It is situated in the mountainous north of the region, near the border with France.
The municipality is small and sparsely populated; according to the 2017 census, it had 85 inhabitants. Like much of rural Navarre, it is a compact settlement set within a sparsely inhabited landscape.