A parasite-host list and host-parasite list, with complete references, of the ecto- and endo-parasites recorded from marine mammals of the North American west coast are presented. One trematode, 7 nematodes, 1 acanthocephalid, 1 copepod, 6 cirripedes, 5 amphipods and a lamprey are reported from 12 species of Cetacea. From 8 species of Pinnipedia, 5 trematodes, 4 cestodes, 12 nematodes, 7 acanthocephalids, 5 Acarina and 4 Anoplura are listed. A single species of Fissipedia has yielded 4 trematodes, 1 cestode, 1 nematode and 2 acanthocephalids, almost all of which have been found in Pinnipedia.