A computer-implemented method for locating lost devices may include (1) receiving a report of a lost device that specifies a hardware address that uniquely identifies the lost device, (2) collecting information from a helper device that has been connected to a local area network that indicates that a device with the hardware address of the lost device was observed as being connected to the local area network, (3) receiving location data from the helper device that specifies a location of the helper device, and (4) providing the location of the helper device as a location of the lost device in response to the report. Various other methods and systems are also disclosed.