International Mother Language Day: Building sustainable, inclusive societies through multilingual education Updated Feb 21, 2021 | 05:55 IST International Mother Language Day is commemorated every year on February 21, with the aim to promote linguistic diversity and multilingualism. International Mother Language Day [Representative image] | Photo Credit: iStock Images Key Highlights This year, the theme of International Mother Language Day is 'Fostering multilingualism for inclusion in education and society'. This theme acknowledges that multilingualism and the use of mother language can advance inclusion and sustainability in societies. New Delhi: United Nations-designated International Mother Language Day is marked on February 21 every year. The day aims to mobilize public and political will to preserve and protect all languages spoken in the world.