1W

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