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World Book Day or World Book and Copyright Day (also known as International Day of the Book or World Book Days) is a yearly event on 23 April, organized by the United Nations Educational, Scientific and Cultural Organization (UNESCO), to promote reading, publishing and copyright. In the United Kingdom, the day is recognized on the first Thursday in March. World Book Day was celebrated for the first time on 23 April 1995.

The connection between 23 April and books was first made in 1923 by booksellers in Catalonia as a way to honor the author Miguel de Cervantes, who died on this date. In 1995 UNESCO decided that the World Book and Copyright Day would be celebrated on 23 April, as the date is also the anniversary of the death of William Shakespeare and Inca Garcilaso de la Vega, as well as that of the birth or death of several other prominent authors.