Below are some databases and publications for finding reviews of works across many disciplines, with a focus on/bias toward English literature. To search for book reviews that center more diverse perspectives or that come from a wider range of fields, consider using research guides focused on disciplinary areas:

Research guides by subject area

In addition to databases, a good place to start is OneSearch. You can search for the title of the work for which you're looking for reviews, and limit results by Format: "Reviews":