Grey sisters

Grey sisters may refer to:


 * Graeae or Grey sisters, three old women from Greek mythology
 * Lady Jane Grey, Lady Katherine Grey, and Lady Mary Grey from 16th-century Tudor England
 * Meredith Grey, Lexie Grey and Molly Grey-Thompson from the TV series Grey's Anatomy

Catholic religious sisters

 * Daughters of Charity of Saint Vincent de Paul or Grey sisters, society of apostolic life based in France
 * Grey Nuns, Canadian religious institute based in Montreal
 * Grey Sisters of the Immaculate Conception based in Pembroke, Ontario, Canada
 * Family Care Sisters or Grey sisters, Australian congregation founded by Cecily Maude O'Connell