Who have you dressed as on World Book Day? Check out this picture gallery for some of the best costumes we've seen today.
These kids all go to a school in Birmingham and dressed up as their favourite book characters. They also read their favourite books in our assembly. They had a competition to see who had the best costume in each class, with the teachers acting as judges.
Phoebe says she adores reading and her mum has been reading to her since she was a baby. She dressed as Dorothy from 'The Wizard of Oz'. She took her favourite book to school today, 'The Velveteen Rabbit'.
Phoebe from Wolverhampton is looking the part as Elizabeth Allen from 'Naughtiest Girl'
Beware! Felix from Southampton is 'Plop the Owl'.
Amber loves reading out of school and has decided to dress up as the 'Cat in the Hat'.
Oscar from Kent is rocking those shades as Willy Wonka from 'Charlie and the Chocolate Factory'.
Korinna from Leeds enjoys reading books by Charles Dickens, Francis Hodgson Burnett and Jacqueline Wilson. Here she is as Sara Crewe from 'A Little Princess'.
Leah aged 8 from Birmingham went to school today as Little Red Riding Hood