Kate Duchêne (born Catherine Anne Purves Duchêne, 5 July 1959) is an English actress best known for her role as the teacher Miss Hardbroom in the adaptation of the children's books The Worst Witch. Duchêne started to act at the age of 14.

She studied French and Spanish at Trinity College, Cambridge in the 1980s, where she became a member of the Footlights theatre group, writing and performing her own material. She also acted with the Cambridge Mummers, appearing in such plays as Measure For Measure (as Isabella) in Cambridge and the Edinburgh Fringe. In the 1980s she joined the Traverse Theatre in Edinburgh, appearing in the premiere productions of Losing Venice and The White Rose.