La rata noruega presenta un pelaje áspero y grueso con prominentes orejas desnudas y cola prácticamente desnuda, que generalmente es más corta que el cuerpo y cabeza. El color, en general, es café o gris obscuro en las partes superiores, con pelos negros alternados y un color más claro grisáceo en el vientre. Las hembras tienen 12 mamas. Al igual que el resto de los roedores, posee cuatro incisivos, dos superiores y dos inferiores, carece de caninos y premolares anteriores lo que ocasiona que haya un diastema. Sus incisivos crecen durante toda su vida a partir de la base, que va sustituyendo la porción desgastada por la actividad de cortar y roer materiales duros. La parte exterior del diente es más dura y carece de nervio, salvo en la base (Nowak 1991).
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