Sally Macart Walker is an American writer of nonfiction for children. She is best known for writing about scientific subject matter such as Mystery Fish: Secrets of the Coelacanth (2005) or Written in Bone: Buried Lives of Jamestown and Colonial Maryland (2009). Additionally, Walker is known for books written in both Spanish and English (bilingual books) as seen in La Luz/Light (2007) and La Electricidad/Electricity (2007). She is also known as Sally Fleming.