Make Camera not render individual GameObject?

Is there a way to make a Camera not render an individual GameObject, without placing it on a layer and setting the Camera to not cull it?

I have multiple cameras viewing that GameObject, and want it to show up in one but not the other.

Thank you for any help!

You either need to use layers and culling, or just disable the renderer on the object:

gameObject.renderer.enabled = false;

Edit: Oh, you said multiple cameras, I missed that. In that case, you need to use layers and culling, that's the only way (and the intended purpose of the layer system).