Nancy Farmer (born July 9, 1941) is an American writer of children's and young adult books and science fiction. She has written three Newbery Honor books and won the U.S. National Book Award for Young People's Literature for The House of the Scorpion, published by Atheneum Books for Young Readers in 2002.

Nancy was born in Phoenix and grew up in a hotel on the Arizona-Mexico border where she worked the switchboard at the age of nine. She also found time to hang out in the old state prison and the hobo jungle along the banks of the Colorado River. She attended Reed College in Portland, Oregon, earning her BA in 1963. Instead of taking a regular job, she joined the Peace Corps and was sent to India (1963-1965). When she returned, she moved into a commune in Berkeley, sold newspapers on the street for a while, then got a job in the Entomology department at UC Berkeley and also took courses in Chemistry there. Restless, again, she decided to visit Africa.