Alesón is a town and municipality in the province and autonomous community of La Rioja, in northern Spain. It lies within the Ebro Valley region of La Rioja, a small autonomous community in the north of the country.
The municipality covers an area of 6.49 square kilometres (2.51 square miles). It is a small settlement: as of 2011 its population was 117 people, and by 2023 the population was estimated to have fallen to 98.
Like many municipalities in rural La Rioja, Alesón is characterised by its very small size and low population density, with the surrounding landscape dominated by the agricultural terrain typical of the region.