Youngsters and their families demonstrated great ideas and originality to join in the fun activities centred around the world of books and reading.
Schools around Sleaford and district invited pupils to dress up as their favourite book characters, bring in their favourite books and share in literary activities.
Here are more images that you sent in.
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World Book Day at Church Lane School, Sleaford. Photo: Church lane school
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World Book Day at Church Lane School, Sleaford. Photo: church lane school
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World Book Day at Church Lane School, Sleaford. Photo: church lane school
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World Book Day at Church Lane School, Sleaford. Photo: church lane school
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World Book Day at Church Lane School, Sleaford. Photo: church lane school
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Isobel Johnson, 10, of Greylees, took part in World Book Day as Hermione Granger. Photo: Bradley Johnson
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Harrison Willis, aged seven, of Helpringham as Emmet from The Lego Movie Book. Photo: Susan Willis
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Everley, age six, from Sleaford, as Mary Poppins. Photo: Sophie Hodson
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Joshua Pearson, of Sleaford, aged two. Photo: Olivia Pearson
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World Book Day at Church Lane School, Sleaford. Photo: church lane school
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World Book Day at Church Lane School, Sleaford. Photo: church lane school
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World Book Day at Church Lane School, Sleaford. Photo: church lane school
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World Book Day at Church Lane School, Sleaford. Photo: church lane school