Kathleen Alexis "Katie" Rosier (née Bell) (b. 7 November 1978) was a British wizard of First Nations and Greek ancestry who attended Hogwarts School of Witchcraft and Wizardry from 1990 to 1997 as part of Gryffindor house. She was the eldest child of Canadian Muggle-born wizard Shaun Bell and his half-blood wife, Veronica (née Macdonald) and elder sister of Jessie Bell.