Annie Letitia Massy (29 January 1868 – 16 April 1931) was a self-taught marine biologist, ornithologist, and an internationally recognised expert on molluscs, in particular cephalopods. She was one of the founders of the Irish Society for the Protection of Birds in 1904. Many of the details of her life are unknown which is attributed to the fact that she is often described as a shy and retiring person, with no known photograph of her in existence.