No, gerbils and hamsters should never be housed together. They are entirely different species with incompatible social structures, activity patterns, and territorial behaviors. Attempting to cohabitate them puts both animals at serious risk of injury or death.

Hamsters are predominantly solitary animals, especially Syrian hamsters, which are fiercely territorial and will attack any animal they perceive as an intruder in their space. Even dwarf hamster species that can tolerate same-species companions are not wired to accept a different species in their territory.

Gerbils are highly social within their own species and live in family clans, but they are also territorial against outsiders. A gerbil would view a hamster as a threatening intruder, and the resulting conflict could escalate quickly to serious biting and fighting.

Beyond social incompatibility, the two species have different environmental needs. Gerbils thrive in lower humidity with deep substrate for elaborate tunnel systems and are active during the day. Hamsters prefer higher humidity tolerance, have different burrowing patterns, and are primarily nocturnal. Temperature, diet, and enrichment preferences also differ in ways that make a shared enclosure impractical even if aggression were not a concern.

The size difference between species also matters. A Syrian hamster significantly outweighs a gerbil and could inflict fatal injuries during a fight. Even among similarly sized dwarf hamsters and gerbils, the different fighting styles and stress responses make cohabitation dangerous.

If you want to keep both gerbils and hamsters, house them in completely separate enclosures in different areas of the room. Even placing cages side by side can cause stress if the animals can see or smell each other. Each species deserves housing and care tailored to its own biological needs.