Heidi Grows Up

Heidi Grows Up (Heidi jeune fille), also known as Heidi Grows Up: A Sequel to Heidi, is a 1936 novel and sequel to Johanna Spyri's 1881 novel Heidi, written by Spyri's French and English translator, Charles Tritten, after a three-decade-long period of pondering what to write, since Spyri's death gave no sequel of her own. It was originally published by Flammarion in Paris (1936), and in New York by Grosset & Dunlap (1938), illustrated by Jean Coquillot.

It was followed by four more sequels: Au pays de Heidi, Heidi's Children, Heidi grand'mère and Le sourire de Heidi, of which only the second one has been translated to English.