and in resident wildlife species in Arctic Alaska.

and are zoonotic protozoan parasites that can infect humans and other taxa, including wildlife, often causing gastrointestinal illness. Both have been identified as One Health priorities in the Arctic, where climate change is expected to influence the distribution of many wildlife and zoonotic diseases, but little is known about their prevalence in local wildlife. To help fill information gaps, we collected fecal samples from four wildlife species that occur seasonally on the northern Alaska coastline or in nearshore marine waters-Arctic fox (), polar bear (), Pacific walrus (), and caribou ()-and used immunofluorescence assays to screen for cysts and oocysts. We detected cysts in 18.3% and oocysts in 16.5% of Arctic foxes ( = 109), suggesting that foxes may be potentially important hosts in this region. We also detected cysts in a single polar bear (12.5%;  = 8), which to our knowledge represents the first such report for this species. Neither parasite was detected in walruses or caribou.