Thirty-one species of opisthobranchs are recorded from the region of Prince Rupert, British Columbia. Of these, the known ranges of the following nine species are extended north to the border between British Columbia and Alaska: Acanthodoris nanaimoensis, Aldisa sanguinea cooperi, Antiopella fusca, Catriona alpha, Coryphella pricei, Dendronotus albus, Doto columbiana, Pleurobranchus denticulatus, and Tritonia festiva.The known range of Rostanga pulchra is extended north to Dundas Island, British Columbia. The known ranges of Acanthodoris hudsoni, Aegires albopunctatus, Coryphella trilineata, Dendronotus diversicolor, Dirona albolineata, and Discodoris heathi are extended north to Porcher Island, British Columbia, and that of Placida dendritica to Triangle Island at the northern tip of Vancouver Island.