Technologies for cross-device shared web resource caching include a client device and a shared cache device. The client device scans for a shared cache device in local proximity to the client device and, in response to the scan, registers with the shared cache device. After registering, the client device requests a cached web resource from the shared cache device. The shared cache device determines whether a cached web resource that matches the request is installed in a shared cache. The shared cache device may determine whether an origin of the request matches the mi gin of the cached web resource. If installed, the shared cache device sends a found response and the cached web resource to the client device. If not installed, the shared cache device sends a not-found response and the client device may request the web resource from a remote web server. Other embodiments are described and claimed.