SYNOPSISTotal numbers, generic distribution and percentage species distribution were determined for the ciliate protozoa in rumen contents obtained from Alaskan moose (Alces americana), musk‐ox(Ovibos moschatus)and Dall mountain sheep(Ovis dalli). The musk‐ox has a fauna somewhat similar to that previously observed in reindeer and caribou. In contrast, only protozoa in the genusEntodiniumwere observed in moose, while Dall mountain sheep have a fauna unique among Alaskan ruminants studied to date. Other thanEntodinium exiguumwhich was common to all animals, only 2 additional species ofEntodinium, observed in the moose and musk‐ox, occurred in more than one animal species. Four new species of protozoa are described,Entodinium dallisp.n.,Entodinium constrictumsp.n. andPolyplastron alaskumsp.n. from the Dall mountain sheep andEntodinium alcessp.n. from