Abstract: A portable room humidifier includes a magnetic mounting structure for mounting the humidifier to a forced convection air register. A compact and lightweight water reservoir replenishes water supply by capillary action to a wicking material which is vertically suspended by a compact support structure in opposing relationship to an air stream flowing from the air register. The wicking material is comprised of readily-available, low cost, highly-water-absorbent fabric. The mounting hardware is configured to be completely contained within the water reservoir for compact, lightweight transport.