An adjustable cervical collar comprises an orthopedic brace assembly adapted for extending around a neck of a wearer, and an adjustable chin support adjacent the brace assembly. An infinitely variable actuator operatively interconnects the brace assembly and the chin support, and defines a infinitely variable linear displacement range between maximum and minimum limits of travel. A locking mechanism cooperates with the actuator to releasably lock the chin support in a selected position within the displacement range, thereby custom setting a height of the chin support relative to the brace assembly.