The International Museum Day is a celebration that is held each year on or about 18 May. Each year, the Advisory Committee of the Internation Council Of Museum (ICOM) defines a specific theme for International Museum Day.

“ The event provides the opportunity for museum professionals to meet the public and alert them to the challenges that museums face if they are to be — as in the ICOM definition of museums — 'an institution in the service of society and of its development."

The theme for 2010 is "Museums for Social Harmony".