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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5. World Book Day
Teachers get in the spirit as they dress as Roald Dahl characters for Longridge Barnacre School's book week in 2009 Photo: Martin Cowey
6. World Book Day
Pupils from St. Anthony's RC Primary School, Fulwood, Preston, dressed in fancy dress as part of the school's book week in 1997. Reception pupils Heather Walker (left) and Stephanie Westray, both aged 5 are dressed as Noddy and Snow White Photo: Godfrey Birtill
7. World Book Day
At the culmination of World Book Week - pupils dressing up in costumes of book characters at St Mary and St Benedict's Catholic Primary in 2009 Photo: Neil Cross
8. World Book Day
Adam Hatton, six, dressed as the Scarecrow to mark the end of the 1997 book week at Ingol Pool House School, Tanterton, Preston Photo: Neil Cross