Links to sites containing list of books on various themes, topics, or subject areas, appropriate for a K-5 audience.
Includes links to searchable databases as well as just lists.

Teach with Picture Books

Reading Rockets - Books by Theme

What to read on the first day of school - annotated list of picture books ( some with extension activities) to share with students at the beginning of the school year

Math bibliography - link goes to a grade 1 list, but you can access other grades from the page

Booktalks (video) from Scholastic

List Exchange - List Exchange: Book Lists Created and Shared by Teachers, Children's Authors and Reading Experts | Scholastic.com