The research centers Donostia International Physics Center (DIPC), CIC nanoGUNE, Materials Physics Center (CFM CSIC-UPV/EHU), CIC biomaGUNE, Biodonostia, Tecnun-School of Engineers, Ceit, POLYMAT, Elhuyar, the Faculty of Informatics of the UPV/EHU-University of the Basque Country and Eureka! Zientzia Museoa (Science Museum) have come together to present a joint program to mark the International Day of Women and Girls in Science scheduled for 11 February across the world. From that day onwards and in Donostia/San Sebastian the program Emakumeak Zientzian 2021 will be run throughout the month of February with workshops, public talks, family experiments, virtual visits, etc. largely adapted to the virtual format due to the health emergency. The initiative aims to make the activity of women in science visible, to break down the typically masculine roles attributed to scientific and technical activities, and to encourage girls and teenagers to opt for careers in science. Emakumeak Zientzian 2021 is being supported by the Chartered Provincial Council of Gipuzkoa, Fomento San Sebastián, the National Research Council (CSIC) and the Spanish Foundation for Science and Technology (FECYT).