| 1952 | | Bengali Language Movement |
| 1955 | | Language Movement Day first observed in Bangladesh |
| 1999 | | 21-F International Mother Language Day
⤷ Por la lengua materna |
| 2000 | | Inaugural celebration of International Mother Language Day |
| 2002 | | Linguistic-diversity theme - 3.000 endangered languages |
| 2004 | | Children-learning theme |
| 2005 | | Braille and sign languages |
| 2006 | | Languages and cyberspace |
| 2007 | | Multilingual education |
| 2008 | | International Year of Languages |
| 2010 | | International Year for the Rapprochement of Cultures |
| 2012 | | Mother-tongue instruction and inclusive education |
| 2013 | | Books for mother tongue education |
| 2014 | | Local languages for global citizenship: spotlight on science |
| 2015 | | Inclusion in and through education: language counts |
| 2016 | | Quality education, language(s) of instruction and learning outcomes |
| 2017 | | Toward sustainable futures through multilingual education |
| 2018 | | Our languages, our assets |
| 2019 | | Year of Indigenous Languages |
| 2020 | | Safeguarding linguistic diversity |
| 2021 | | Fostering multilingualism for inclusion in education and society
⤷ Por la libertad de lengua en la educación |
| 2022 | | Using technology for multilingual learning: Challenges and opportunities |