The event was first celebrated back in 1998 and children are encouraged to dress as their favourite book characters. This selection of pictures captures some of the events that were held since then, right through to 2010, and shows kids from all different schools. Can you spot yourself? Or anyone you know? READ MORE: Go back to 1995 and life in Preston. IN CASE YOU MISSED IT: Look back at Preston Beavers and Cubs through the years. MORE MEMORIES: Go on an adventure with Preston Brownies of the past
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9. World Book Day
Behind you.....On the search for wild animals, Josie Fowler, nine, watched by animals, from left, Charlotte Johnson, seven, Alexandra Chadwick, four, and Luke Riley, eight, during the jungle characters day in 2001 as part of book week at Barton St Mary's and St Andrew's Catholic Primary School at Barton, near Preston Photo: Ian Robinson
10. World Book Day
Pupils at New Longton CE School, dressed in their favourite book characters for Book Week in 2001. Pictured is Henry Bartlett dressed as Paddington Bear Photo: David Hurst
11. World Book Day
Fulwood and Cadley Primary school celebrate book week in 2008 Photo: Donna Clifford
12. World Book Day
Bethany Robinson and fellow English Martyrs pupils are dressed as book characters in 2010 Photo: Kevin McGuinness