Esther Kenworthy Waterhouse (1857–1944), born Esther Maria Kenworthy, was a British artist who exhibited her flower-paintings at the Royal Academy and elsewhere.
She was the daughter of James Lees Kenworthy, an artist and schoolmaster from Ealing, in West London; and Elizabeth, a school-mistress.
She married fellow artist John William Waterhouse at the parish church in Ealing, in 1883, and thereafter used the name Esther Kenworthy Waterhouse. They had two children, but both died in childhood. Initially, they lived in a purpose built artistic colony in Primrose Hill, where the houses had studios. In around 1900, they moved to St John's Wood.
She is buried, along with her husband, at Kensal Green Cemetery.
Waterhouse's portrait of her is now owned by Sheffield City Art Galleries.