RWD may refer to: Real world data, medical data derived from multiple sources and heterogeneous patient populations in real-world settings Rear-wheel drive, method of propulsion in an automobile Rear window defogger, a system to defog/defrost glass in a vehicle's rear window Responsive web design, a methodology for designing web sites that can adapt to a range of screen sizes and device types RWD (aircraft manufacturer), Polish aircraft manufacturer RWD Magazine, a British-based music magazine