Parents have been inundating the Peterborough Telegraph with pictures of their children dressed to impress. We'll aim to update this gallery throughout today and feature as many of your photos as we can.
Wittering Primary School and Nursery pupils Logan, 7, as Will Wonka, Freddie, 3, as Peter Rabbit and Ivy, 2, as Belle sent in by Amy Holmes
Ali, 3, of Bright Stars Day Nursery sent in by Mishel Malik.
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Madison Gilgan (8) and Ella Lily Gilgan (5) doing their 'thing' for world book day at Nene Valley Primary School.
Jamie aged 9, Rebekka aged 11, Zoe aged 9, Daniel aged 10, Oliver aged 7 and Corey aged 6 sent in by Leonie Hanman
Marta from Paston Ridings Primary School dressed as Hermione Granger. Sent in by Yvonne Yozeq.
Phinnley Jones-Webb will be a crayon for World Book Day from the book The Day the Crayons Quit. He is 3 years old and goes to Hampton Vale Primary School
Tracyann Godfrey sent in this photo of George, 7, from Yaxley as Antman
Natalie Upson's sons Alfie and Archie ready for World Book Day
Jack, 6, is ready for World Book Day at Dogsthorpe Infants School. Sent in by Gemma Clark
Harley, 2, and Lexi, 3, ready for World Book Day at Stars Wellend Nursery. Sent in by Gemma Clark
Liz Hart sent in this picture of her daughter in fancy dress from The Day the Crayons Quit and ready for World Book Day at Hampton Vale Pre School
Kiera jones, aged 9, as Gangsta Granny.
Leighton, age 5, Alderman Jacobs Primary School, Whittlesey. Sent in by Clairabella Ann.
Margot Worricker, aged 2, dressed as Mary Poppins.
Suhaan Farooq dressed up as Thor
Kerry Read's son Jacob, 7, ready for World Book Day at Longthorpe Primary
Lynzi Thomas' daughter Isabelle Age 6, from Woodston Primary as Matilda.
Spencer, aged 5, dressed as The Stick Man and ready for World Book Day at Oakdale Primary School. Sent in by Andrea King.
Victoria Haynes sent in this photo of her son Theo dressed as one of the characters from Grandpa's Great Escape and off to Newborough School
Amelia, age 2, as Lilly Bobtail. Sent in by Kirsty Hickey.
Alice Mary Hurry sent in this photo of her son Keegan dressed as Harry Potter
Dagmara adoszek sent in this lovely photo of her daughter ready for World Book Day dressed as Bambi
Jessica Smith from Stilton sent in this picture of her sons, Where's Wally, Cameron aged 11 and Harry Potter, Joshua aged 7.
Emmie Barry age 4, and Benny Donihee age 3 dressed as Dorothy and the scarecrow from The Wizard of Oz. Both go to Orton Longueville playgroup.
Charlotte Royal sent in this picture of her daughters, Aaliyah age 8 as Gangster Granny and Aalaine age 5 as Little Red Riding Hood from All Saints' CofE Primary School
Helen Palmer sent in this photo of her sons Ethan (8) and Dylan (5) who attend Old Fletton Primary School
Luke Wellock, 5, who attends Folksworth CofE Primary School dressed as Mr Tickle
Jayden Pierre Fraser as the alien from the book Way Back Home
Weronika Berezowski sent in this picture of her daughter Olivia, 9, dressed as Hermione Granger from Harry Potter. She attends St John's Church School
Anna Stone sent in this picture of Amber Nicolle of Southfield Primary School dressed as The Paper Bag Princes -
Amy, 11,The Cheshire Cat. Benjamin, 7, The Fantastic Mr Fox. Reagan, 5, the Gingerbread Man and Hannah, 3, as Poppy The Troll all ready for Lime Academy Watergall. Sent in by Catherine Tilley.
Vicky Cooper sent in this picture of Summer, 7, ready for Woodston School
Vicky Cooper sent in this picture of Thomas, 4, ready for Woodston School
Zoe Lander sent in this photo of her nephew, aged 6, dressed as Toothless from How to Train Your Dragon ready for Dogsthorpe Infants School
Alfie-James, aged 3, as Postman Pat, sent in by Nicole Marie Sanders
Joanne Sharpe sent in this photo of William, 7, ready for World Book Day at Stanground St John's Primary School dressed as the Hungry Caterpillar.
Rakia Perveen sent in this photo of Zoya as Queen of hearts. Ameera as Cinderella and Suhaan as Thor all from Lime Academy Watergall
Paul Hill, aged 7, as Captain Hook from Peter Pan
Angelique McGroarty sent in this photo of Ethan, 6, as The Cat in the Hat and Molly, 7, as Little Panda
Haya Farooq, age 3, ready for Rise and Shine Nursery in Netherton
Grace Linzi Astill, age 2, ready for World Book Day at Kiddicaru Nursery
Aiden (left) aged 6, Kyi (right) aged 4, ready for World Book Day at Welland Academy in Peterborough
Harvey aged 9 as Gregg Heffley from Diary of a Wimpy Kid sent in by Jessica Taylor
Werrington Village Playgroup
Dylan Chase Moles age 5 as Toothless from How To Train Your Dragon, ready for World Book Day at St John's Church School
Harry, 6, and Oscar, 4, ready for World Book Day at Nene Valley School. Sent in by Vicki Price
Elsie, 3, ready for World Book Day sent in by Vicki Price
Emam, age 4, ready for World Book Day Peakirk Cum Glinton Primary. Photo sent in by Leah Clifford
Eesa Herish,2, ready for World Book Day at Peakirk Cum Glinton. Photo sent in by Leah Clifford
Charlie Pope aged 7, ready for World Book Day at Old Fletton Primary School.
Logan, 3, Emily, 5, Lacey-mae, 5, Sophie, 8, and Katie, 8, ready for World Book Day at St John's Pre/Primary School in Stanground. Sent in by Jodie Smith
Sienna, 7 months, was not going to miss out on World Book Day either. Photo sent in by Jodie Smith
Elodie, aged 15 months dressed as Hermione Granger, sent in by Hannah Goodwin
Niamh Broughton, aged 7, dressed as Matilda attending Southfields Primary School. Sent by Lauren Broughton