This morning, we asked readers of the Lancashire Post to share their little one's fabulous costumes and they did not disappoint.
In fact we received so many great pictures - nearly 300 - that we have had to make two photo galleries to show them all off.
You can see part one of the World Book Day gallery here but look below at even more of the amazing costumes from across Lancashire...
Are you in need of some new books for you or your little one, here is our guide to the best bookshops in Lancashire.
1. Emilia and Mason
L: Emilia age 4 as Skye from Paw Patrol. R: Mason age 2 as Dobby the elf
2. Lottie, Henry and Ethan
L: Lottie as Matilda and Henry as Willy Wonka. R: Ethan age 6 as a card soldier from Alice In Wonderland
3. Nellie, 'Little Red Riding Hood' and 'Woody'
L: Nellie age 6 as barbie. R: Little Red Riding Hood and Woody
4. Ellis, Libby and Cobé
L: Ellis age 6 as Harry Potter and Libby age 3 as Elsa. R: Cobé aged 3 as The Gruffalo