The fab photos capture pupils in the Larne, Carrickfergus, and Newtownabbey areas between 2012 and 2016.
Can you spot anyone you know?

5. World Book Day
Zara, Gabriel, Jonathan, Chloe and Erin at Ballynure Primary School's Mad Hatters Tea Party for World Book Day, 2015. INNT 10-034-GR Photo: Graham Ross

6. World Book Day
Miss Kirk, principal of Linn Primary School Nursery reads a story to children during World Book Day in 2014. INLT 11-041-PSB Photo: Phillip Byrne

7. World Book Day
Larne & Inver Primary School P1 pupils Harry, Ashton, Reuben, Caleb and Ethan dressed up for World Book Day at the school in 2014. INLT 11-057-PSB Photo: Phillip Byrne

8. World Book Day
Among those who took part in Oakfield Primary School's World Book Day event in 2012 were Kyle and Joel. INCT 10-034-tc Photo: Tim Cully
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