Water rat

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
 * The Rat zodiac sign is associated with the element of water
 * 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