- Mathilda Grimblehawk: "Winifred Whittle? Sorry to intrude, but we're from the Ministry of Magic. We need to ask you a few questions."
- Winifred Whittle: "Finally, a response to my letters about the scandalous fairy habitat intrusion!"
- — Mathilda Grimblehawk and her partner first approach Whittle to enquire about the attacks on Muggle construction workers[src]
Winifred Whittle was a British witch who established the Witches' Holistic Institute for Friends of Fairies (or, simply, WHIFF) of which only she and Sage Bragnam were members.
Bethany Harrison, the daughter of the foreman of the Muggle construction works, was scared of her and included her in a drawing of the forest in which she was depicted as a green-skinned hag with sharp teeth. While at first, Mathilda Grimblehawk suspected it might be Whittle that was attacking the Muggle construction workers in an attempt to scare them away from the forest, after meeting her, she dismissed it, regarding her as "a harmless fairy fanatic".
- Fantastic Beasts: Cases from the Wizarding World (First appearance)