Many left their normal school uniforms at home on Thursday, March 6 and instead dressed up for the day as characters from their favourite books.
Photographer Tony Hendron took these great pictures when he popped into St John The Baptist Primary School / Bunscoil Eoin Baiste, Ballyoran Primary School, Hart Memorial Primary School and Millington Primary School.
We also asked our readers to share photos of their children dressed up in their fun costumes and we were delighted with the response. Thanks to all who shared their pictures with us.
17. World Book Day
Book characters brought to life by Ballyoran Primary School pupils, Cain as Harry Potter, Alesshandra as the Little Mermaid and Katie as Gangsta Granny. PT09-206. Photo: TONY HENDRON
18. World Book Day
Ballyoran Primary School pupils Riley, Mila and Harley dressed as their favourite book characters. PT09-205. Photo: TONY HENDRON
19. World Book Day
The staff of Ballyoran Primary School weren't going to be left out on World Book Day and they dressed as book characters along with the pupils. PT09-208. Photo: TONY HENDRON
20. World Book Day
P6 pupils of Ballyoran Primary School and teacher Miss Melissa McKernan getting into the spirit of World Book Day. PT09-207. Photo: TONY HENDRON