Valdemadera is a village and municipality in the province and autonomous community of La Rioja, in northern Spain. It lies within the Ebro Valley region of the country, in an area characterised by a sparse, rural population.
The municipality covers an area of 13.93 square kilometres (5.38 square miles). As of 2011, it had a population of 9 people, making it one of the smallest municipalities in La Rioja by number of inhabitants.