Hogwarts caretaker Argus Filch’s cat is named Mrs Norris.
Mrs Norris is a thin, dust-coloured cat who patrols Hogwarts with Filch. She watches students closely and often alerts Filch when she sees rule-breaking, making her one of the school’s most persistent sources of trouble for Harry and his friends.
Her name is a reference to Mrs Norris, a character in Jane Austen’s novel Mansfield Park. The Harry Potter character is not a witch or wizard, and the books never identify her as a magical creature. This distinguishes her from other animal companions in the series, such as Hermione’s half-Kneazle cat, Crookshanks.
A common mix-up is confusing Mrs Norris with Arabella Figg’s cats, who appear in Harry’s neighbourhood, or with Filch himself. Mrs Norris remains associated specifically with Hogwarts, its corridors, and the school caretaker’s investigations.