Kathleen Honora Greatorex (September 10, 1851[1]–1942) American painter and illustrator born in Hoboken, New Jersey, known for her still life and flower paintings.

During the final years of his life, noted Impressionist painter Alfred Sisley, resident of Moret, developed a close friendship with Kathleen Greatorex.

Following the death of her sister Eleanor Elizabeth Greatorex (1854-1908) Kathleen sold a portion of her property to American art-dealer and critic Sarah Tyson Hallowell, whose niece Harriett Hallowell was named as Kathleen's sole heir when Greatorex died of old age (91) on May 6, 1942 at 3 Place de Samois in Moret-sur-Loing.

[2] Greatorex showed at least three pieces at the 1893 World's Columbian Exposition in Chicago.

2020 Greatorex’s work as a still life painter is discussed by art historians Gerdts and Burke in their book American Still Life Painting (1971)[5] Her sister, Eleanor Elizabeth Greatorex (1854-1908) was also a well known painter.