RGW could refer to:
- Comecon; Russian - Совет экономической взаимопомощи - СЭВ
- Ramsgreave and Wilpshire railway station, England; National Rail station code RGW
- Residential gateway, a hardware device connecting a home network with a wide area network (WAN) or the internet
- Rio Grande Western Railway
- RGW is an abbreviation for "red-green-white", just as RGB is an abbreviation for "red-green-blue", which is a very important concept in color television, color photography, etc. See RGB color model.