Heidi is a work of children's fiction published in 1881 by Swiss author Johanna Spyri, originally published in two parts as Heidi: Her Years of Wandering and Learning and Heidi: How She Used What She Learned. It is a novel about the events in the life of a young girl in her paternal grandfather's care in the Swiss Alps. It was written as a book "for children and those who love children".

Heidi is one of the best-selling books ever written and is among the best-known works of Swiss literature.