World Book Day, also known as World Book and Copyright Day or International Day of the Book, is an annual event organized by UNESCO (United Nations Educational, Scientific and Cultural Organization) to promote reading, publishing, and copyright.

The first World Book Day was celebrated on 23 April in 1995, and continues to be recognized on that day. A related event in the United Kingdom and Ireland, also called World Book Day, is observed in March. On the occasion of World Book and Copyright Day, UNESCO along with the advisory committee from the major sectors of the book industry, select the World Book Capital for one year. Each designated World Book Capital City carries out a program of activities to celebrate and promote books and reading.