A computer-implemented method for providing secure access to local network devices may include (1) identifying a local area network that provides Internet connectivity to at least one device within the local area network, (2) obtaining, from an identity assertion provider, (i) a shared secret for authenticating the identity of a guest user of the device and (ii) a permission for the guest user to access the device from outside the local area network, (3) storing the shared secret and the permission within the local area network, (4) receiving, via the Internet connectivity, a request by the guest user from outside the local area network to access the device, and (5) providing access to the device in response to validating the request based on the shared secret and the permission. Various other methods and systems are also disclosed.