Tiw, TiW or TIW may refer to:
Tiw (Uru god), an Incan god Týr, a god in Germanic paganism, spelled Tiw in Old English Telesystems International Wireless, a Canadian global mobile communications operator Tropical instability waves, a westward-propagating wave Tiw Valley, named after the Norse god Týr Tactical Imagery-Intelligence Wing, responsible for the processing of fast-jet electro-optic imagery Tin Wan station, by MTR station code Tacoma Narrows Airport, by IATA code Titanium Tungsten (TiW), a titanium alloy used in the semiconductor industry tîw, Sindarin alternate name for the Tengwar in J.R.R. Tolkien's legendarium