Santa Eulalia de Gállego is a municipality in the province of Zaragoza, in the autonomous community of Aragon, Spain. It is a small, sparsely populated settlement typical of the rural municipalities found across this part of northeastern Spain.
According to the 2004 census conducted by the Instituto Nacional de Estadística (INE), the municipality had a population of 134 inhabitants. That figure reflects the modest scale of the community and its character as a small rural locality within the Zaragoza province.