Arthur Spiderwick is the author of Arthur Spiderwick's Field Guide to the Fantastical World Around You and a supporting character in The Spiderwick Chronicles. He is the great-great uncle of the Grace children, the father of Aunt Lucinda, and the one who discovered the magical world of Faerie. Throughout the books, he is trapped in the spirit world but cares for the fantastical creatures and has wise words for Jared.
- Arthur Spiderwick is based on a real scientist.
- In the film adaptation, he is played by Academy Award nominee David Strathairn.