The International Day of Mathematics (IDM) is a worldwide celebration held each year on March 14. Background March 14 was chosen as the date for the IDM because it was already celebrated in many countries as Pi Day, based on the fact that some countries write it as 3/14 and the mathematical constant Pi is approximately 3.14. The International Day of Mathematics project is led by the International Mathematical Union with the support of numerous international and regional organizations from all over the world. It was proclamated by UNESCO on the 40th session of the General Conference, November 26, 2019. The first celebration was held on March 14, 2020. Goals of the IDM The major goals of an International Day of Mathematics, with expected benefits for students, for teachers, for women and girls and for society at large are to: Improve understanding among the general public, decision makers and in schools, of the importance of mathematics in education; Contribute to capacity building in mathematical and scientific education, with special focus on girls and children from developing countries (SDG4); Achieve gender equality and empower women and girls in mathematics (SDG5); Improve understanding among the general public, with decision makers and in schools of the importance of mathematics as a tool for developments which lead to more prosperous economy circumstances (SDG9); Emphasize the importance of basic research in mathematical sciences as the seed to breakthroughs in technology and the management of society (SDG8); Highlight the role of mathematics in the organization of modern society, including economic, financial, health and transport systems, telecommunications in the quest for human well-being, etc. (SDG3); Raise awareness of the role of mathematics in fighting disasters, epidemics, emerging diseases, invasive species (SDG11); Highlight the role of mathematics in moving to a circular economy of sustainability compatible with preservation of biodiversity (SDG14 and 15); Equip the general public and young people with tools for understanding the planetary challenges and the capacity to respond as knowledgeable citizens; Increase international networking and collaborations in public awareness of mathematics; Increase the access to information, providing a simple way to give citizens a choice in all aspects of their daily life. Theme for 2026 - Mathematics and Hope On 14 March, the International Day of Mathematics (IDM), proclaimed by UNESCO, will be celebrated under the theme "Mathematics and Hope". The theme highlights mathematics as a universal language that fosters understanding, teamwork, and optimism, enabling solutions that benefit everyone. Greek philosopher and mathematician Thales once said, “Hope is the most universal of all human possessions.” With the 2026 theme “Mathematics and Hope,” UNESCO celebrates mathematics as a universal language that inspires understanding, cooperation, and optimism in tackling humanity’s shared challenges. The 2026 theme, Mathematics and hope, reflects the idea that mathematics, like hope, is one of humanity’s most universal assets. Mathematics enables a deeper understanding of reality, supports the development of shared frameworks and definitions, and strengthens collaboration across disciplines and societies. Through responsible use of data and rigorous reasoning, mathematics contributes to solutions that serve the common good. Mathematics equips us to navigate uncertainty, build trust in knowledge, and imagine more inclusive and sustainable futures. Beyond driving scientific and technological progress, it also contributes to social cohesion and resilience. By fostering collaboration, trust and mutual benefit, mathematical thinking encourages more equitable and cooperative societies. In line with its mandate, UNESCO supports students and educators worldwide in discovering mathematics as a tool for understanding, cooperation and hope. Sources International Mathematical Union UNESCO