The origins of International Archives Day are closely connected with the International Council on Archives. The ICA was established on June 9, 1948, under the auspices of UNESCO, with the goal of encouraging international cooperation in the preservation, management and use of archives. The anniversary of that founding later became the date chosen for the worldwide observance.
Interest in establishing a day devoted specifically to archives grew during the early 2000s. At the International Congress on Archives in Vienna in 2004, participants adopted a resolution asking for greater international recognition of the importance and value of archives.
In 2005, UNESCO established the World Day for Audiovisual Heritage, observed on October 27. While that day brought valuable attention to audiovisual records, the archival community continued to see a need for an observance covering the much wider range of documentary and archival heritage.
At its Annual General Meeting in 2007, the International Council on Archives decided that June 9 would be celebrated as International Archives Day. The first celebrations followed in 2008, coinciding with the ICA's 60th anniversary.
The observance later grew beyond a single day. In 2019, the ICA expanded its international campaign into International Archives Week, giving institutions more time to organize events, share collections and discuss issues such as preservation, access, accountability, heritage and digital records. International Archives Day remains June 9 at the centre of that wider celebration.