But was your loved one in the picture as they dressed up for the day of reading fun?
Take a look and remind yourselves of some wonderful scenes.
1. Fun in 2019
Lynnfield Primary School staff member Brian Umpleby with pupils (left to right) Alex Burn-MCrossen, Jade Chawner and Riley Stead dressed for World Book Day in 2019. Photo: Frank Reid
2. Super at St Bega's
Children at St Bega's RC Primary School were enjoying a good read on World Book Day in 2008. Photo: hm
3. Back to 2006
Wizards, Robin Hood and Dennis the Menace at West View Primary School in 2006. Remember this? Photo: hm
4. Thrilling at Throston Primary
A 2008 reminder of World Book Day at Throston Primary School. Photo: GW