Water rat(s) may refer to:
Animals Water rat is a common name for a number of not closely related types of semiaquatic rodents of superfamily Muroidea, including: Ucayali water rat or amphibious rat (Amphinectomys savamis), a cricetid found in Peru European water vole (Arvicola amphibius, formerly A. terrestris), a cricetid in north and central Europe and Russia Baiyankamys, a murid genus of two species from New Guinea African wading rat (Colomys goslingi), also called African water rat Earless water rat (Crossomys moncktoni), a murid of eastern New Guinea Hydromys, a murid genus of four species of Australia and New Guinea Nectomys, a cricetid genus of five species of South America Florida water rat or round-tailed muskrat (Neofiber alleni), a cricetid in the United States Sulawesi water rat (Waiomys mamasae), a murid of Sulawesi False water rat (Xeromys myoides), a murid of northern Australia and southern New Guinea
Other Water Rats (TV series), an Australian police procedural drama originally airing from 1996 to 2001 and focusing on the Sydney Water Police The Grand Order of Water Rats, an entertainment industry charity based in London, England Water Rat (Chinese Zodiac), the 49th combination of the sexagenary cycle The nickname of the 3rd Canadian Infantry Division Ratty (water vole), a character in the novel The Wind in the Willows De Walrot, Zaanstreek, a windmill moved to IJlst, Friesland in 1828 Monto Water Rats, a music venue in London