An inventory of the mosquitoes of Grand Teton National Park and the John D. Rockefeller, Jr. Memorial Parkway was conducted during 1998 and 2000. Twenty-five culicid species belonging to 3 genera and 5 subgenera were recorded. This is the 1st substantive effort to record the mosquito fauna of this national park since its establishment in 1929. Collection of specimens of Ochlerotatus communis and Ochlerotatus nevadensis from the same larval site supports the species status of Oc. nevadensis.