"The Greatest Crush of All" is the fifty-eighth episode of Lizzie McGuire.
Lizzie, Miranda and almost every girl in their class have a crush on their new English teacher, Mr. Keith, who is from England. Meanwhile, Fredo the chimp comes to stay at the McGuire's home and Matt is not happy with it. With some intervention from Jo and Sam, soon Matt and Fredo are getting along very well.
- When Mr. Keith says that the gang should thank Lizzie for getting them started on the long and winding road of poetry this is a reference to The Beatles song "The Long and Winding" road written by Paul McCartney.