Abstract: The present invention is directed to a head immobilizer used with a cervical collar. The cervical collar comprises a front and rear half, each half being U-shaped, and a reinforcing member affixed to each half. A head immobilizer generally includes a head rest which is T-shaped and which has a stem and two arms. Each arm has a distal end. The stem releasably engages the reinforcing member affixed to the rear half of the collar. A fastening device is affixed to the distal end of each arm. A mask has an opening therethrough and overlaps, in part, the front half of the collar. A mating device is affixed to the mask and engages the fastening device. A securing device is affixed to the mask and engages the fastening device. Whereby, a victim's head is immobilized between the head rest, mask, and collar, when the fastening device is connected with the mating device and the securing device.