The International Day of Women and Girls in Science is an annual observance adopted by the United Nations General Assembly to promote the full and equal access and participation of females in Science, Technology, Engineering and Mathematics (STEM) fields. The United Nations General Assembly passed resolution 70/212 on 22 December 2015, which proclaimed the 11th day of February as the annual commemoration of the observance. A theme is selected annually to highlight a particular focus and area of discussion around a focus point for gender equality in science.

The International Day of Women and Girls in Science is implemented annually by UNESCO in collaboration with UN Women. Both organisations work with national governments, intergovernmental organisations, civil society partners, universities and corporations in order to achieve the shared goal of promoting the role of women and girls in scientific fields and celebrate those already successful in the field.