Catherine Earnshaw is a fictional character and the female protagonist of the 1847 novel Wuthering Heights written by Emily Brontë. Catherine is one of two surviving children born to Mr. and Mrs. Earnshaw, the original tenants of the Wuthering Heights estate. The star-crossed love between her and Heathcliff is one of the primary focuses of the novel. Catherine is often referred to as "Cathy," particularly by Heathcliff.

Wuthering Heights is the only novel by the English author Emily Brontë, initially published in 1847 under her pen name "Ellis Bell". It concerns two families of the landed gentry living on the West Yorkshire moors, the Earnshaws and the Lintons, and their turbulent relationships with the Earnshaws' foster son, Heathcliff. The novel was influenced by Romanticism and Gothic fiction.