Bergasillas Bajera is a village and municipality in the province and autonomous community of La Rioja, in northern Spain. It is one of the many small settlements that make up the sparsely populated Rioja region, located in the Ebro valley area of the country.
The municipality covers an area of 9.70 square kilometres (3.75 square miles). As of 2011, it had a population of 35 people, making it one of the smallest municipalities in La Rioja by population. Its very low population density reflects the broader demographic pattern of rural villages in this part of Spain.