Common Sense Media is a great website to browse for book recommendations that can be specific to your child's interests. Below, are several recommended lists. To filter the age level, click "Big Kids (8-9)" and "Tweens (10-12)."
Best Books for 4th Grade
Best Book Series
NY Times Best Sellers
Coretta Scott King Award
Newbery Medal and Honor Books
Nonfiction
Biography
Graphic Novels (History focused)
Historical Fiction
Science Fiction
Realistic Fiction
Social Justice
Friendship
Self-Esteem
Superhero
Adventure
Mystery
Female focused heroes
Multicultural Focused
Family
Poetry