Hannah is the mouse character who only appeared in the television series of Watership Down.

Prior to moving to Watership Down with Kehaar, she lived in Nuthanger Farm with the farmer's dog, Duster and cat, Tabitha. In the second episode of the series, she was used as bait to lure a troublesome weasel into a rock tunnel, since the escape hole in the burrow was small enough for her. Hannah lived on Watership Down with the rabbits afterwards, and became one of the supporting main characters in the series.