The annual celebration of reading always sees a great effort by mums and dads making sure their children are looking smart and book-themed.
Today is no different, with dozens of pictures being submitted to The News this morning. Here’s a selection of some of the first to come in - it’s a delight to see so many smiling faces.
Keep an eye on portsmouth.co.uk today as later on there is a World Book Day-themed event at Fratton Park that aims to break a world record.
1. Jasmine Fay sent in a picture of Deklan Avis, nine, from Havant dressed as Jack - with his beanstalk
Jasmine Fay sent in a picture of Deklan Avis, nine, from Havant dressed as Jack - with his beanstalk | Jasmine Fay Photo: Jasmine Fay
2. Lynsey Anne Jackson sent in this snap of Frank, eight, as Book Man and Elsie, seven, as Mary Poppins
Lynsey Anne Jackson sent in this snap of Frank, eight, as Book Man and Elsie, seven, as Mary Poppins | Lynsey Anne Jackson Photo: Lynsey Anne Jackson
3. Tracy Shawyer sent in this picture of Summer as Red Riding Hood
Tracy Shawyer sent in this picture of Summer as Red Riding Hood | Tracy Shawyer Photo: Tracy Shawyer
4. Ash Wheatley said: 'My son is going as a character from the book I’ve written about school anxiety. Proud Dad today!'
Ash Wheatley said: 'My son is going as a character from the book I’ve written about school anxiety. Proud Dad today!' | Ash Wheatley Photo: Ash Wheatley