Bacteria belong to the Domain Bacteria, which is one of the three domains of life (the other two being Archaea and Eukarya).

Here's a breakdown:

* Domain: Bacteria

* Kingdom: Bacteria (Note: Bacteria are often considered a kingdom as well, as they are a distinct group within the domain)

It's important to remember that bacteria are prokaryotes, meaning they lack a nucleus and other membrane-bound organelles found in eukaryotic cells.