1W or 1-W may refer to:
1st meridian west
Roads OR 1W; see Oregon Route 99W SSH 1W (WA); see Washington State Route 104 Arkansas Highway 1W; see Arkansas Highway 1
Aircraft AH-1W, a model of Bell AH-1 Cobra AH-1W, a model of Bell AH-1 SuperCobra PB-1W, a model of Boeing B-17 Flying Fortress HR2S-1W, a model of Sikorsky CH-37 Mojave XS2U-1W, a model of Vought XS2U
See also Watt Week Win–loss record W1 (disambiguation)