Here are five publishers that you might consider for fantasy young adult and middle grade novels:
HarperCollins is a major publisher that publishes a wide range of books, including fantasy young adult and middle grade novels.
Scholastic is a publisher that specialized in children's and young adult books, including fantasy young adult and middle grade novels.
Macmillan is a major publisher that publishes a wide range of books, including fantasy young adult and middle grade novels.
Hachette is a major publisher that publishes a wide range of books, including fantasy young adult and middle grade novels.
Lee & Low Books is an independent publisher that specialized in children's and young adult books with diverse voices and representation. They publish a wide range of genres, including fantasy.
It's important to research the specific submission guidelines for each publisher before submitting your book. You may be able to find this information on the publisher's website or by contacting the publisher directly. It's also a good idea to familiarize yourself with the types of books that each publisher typically publishes, as this will help you determine which publishers are the best fit for your book.