International Mother Language Day: Why language matters for sustainable development

Every year on 21 February, International Mother Language Day reminds us that language is about much more than communication. The language we grow up speaking shapes how we learn, how we see ourselves, and how included we feel in society. It also plays a crucial role in tackling global challenges such as inequality, access to education, and social justice.

These challenges sit at the heart of the United Nations Sustainable Development Goals (SDGs) - 17 global goals agreed by world leaders to improve lives and protect the planet by 2030. While language is not named as a goal in its own right, it underpins many of them. Without addressing language barriers, progress towards quality education, reduced inequality, and peaceful societies becomes far more difficult.

International Mother Language Day shines a spotlight on the importance of linguistic diversity and multilingual education, and why they matter for sustainable development worldwide.

The origins of International Mother Language Day

International Mother Language Day has been observed annually since 2000, however its origins go back to the establishment of Pakistan in 1947, when the nation underwent a geographical partition into East and West Pakistan, with a substantial distance of 1,000 miles between them.

Despite a shared Muslim majority, significant cultural differences existed between the two regions. The roots of the conflict that ultimately led to the independence of East Pakistan, now known as Bangladesh, in a harrowing civil war in 1971, can be traced back to linguistic divisions.

In 1952, the government declared Urdu as the country’s sole official language, even though the majority of people in East Pakistan spoke Bangla (Bengali). This decision triggered widespread protests in Dhaka, led largely by students, who demanded recognition of Bangla as a national language. The peaceful demonstrations were met with violence, and several protesters were killed.

This poignant sacrifice for linguistic rights is now commemorated on International Mother Language Day – a day first proclaimed by UNESCO and later adopted by the UN General Assembly.

The significance of this day lies not only in its commemoration but also in its contribution to fostering sustainable societies.

What do we mean by “mother language”?

As defined by the Cambridge Dictionary, one's mother tongue or language is the primary language acquired during infancy, distinct from languages learned in educational settings or adulthood. While the terms "mother tongue" and "first language" are often used interchangeably, nuances exist: the former is acquired from parents during early childhood, and the latter denotes the initial language exposure. Nonetheless, they may align as the same language.

2026 theme and why it matters for the Sustainable Development Goals

UNESCO introduces a new theme each year to highlight the importance of mother languages. In 2026, the theme “Youth Voices on Multilingual Education” underscores the essential role young people play in shaping the future of multilingual learning and promoting linguistic diversity.

A 2025 international study found that mothertongue instruction significantly enhances comprehension, retention, critical thinking, and classroom participation, while also reducing school dropout rates. Yet despite these proven benefits, access remains uneven.

UNESCO reports that around 40% of the global population still does not receive education in a language they speak or understand, a barrier that continues to undermine learning outcomes and long‑term educational success.

International Mother Language Day closely supports the UN Sustainable Development Goals, especially SDG 4: Quality Education, which underpins progress toward all other SDGs. Despite the increasing number of children going to school worldwide, learning outcomes remain deeply concerning. Around 53% of children in low‑ and middle‑income countries cannot read and understand a simple story by the end of primary school, and in the poorest countries, this rises to 80%, signalling a global learning crisis.

The UN aims to cut learning poverty by half before 2030 and strengthening mother‑tongue education is central to this effort. Learning in a familiar language lays the foundation for strong literacy, supports the acquisition of additional languages, and reinforces children’s cultural identity, pride, and sense of belonging.

This approach also aligns with SDG 10: Reduced Inequalities and SDG 16: Peace, Justice, and Strong Institutions, as recognising and valuing diverse mother languages promotes inclusion, understanding, and more equitable, peaceful societies.

Looking ahead

Countries such as India, South Africa, Bangladesh, Nepal, and the Philippines have begun implementing multilingual education policies, despite facing challenges such as limited resources and global pressures. The ongoing commitment and initiatives of these countries underscore the resilience and determination needed to overcome the challenges and advance the cause of linguistic diversity in education globally.

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