Yes but it depends what kind of gourami, what size tank, and what kind of other fish.
Gouramis are actually not aggressive. They are simply territorial (like most labrynth fish), particularly towards other males. They often don't get along with other long finned fish like a betta.
Dwarf gouramis get around 2-2.5" and are fairly peaceful. I'd only get one, however. Though that does depend a bit on your other fish as I said.
That said, it depends a lot upon the fish's individual personality (again, a lot like bettas). I have two male pearl gouramis living in my 55g and they leave each other alone. However, I've got a platinum gourami that doesn't get along with them and had to be removed.