Abstract: An occlusive wound dressing for penetrating thoracic trauma including a silicone impregnated gauze pad covered by an overlapping thin, flexible, plastic sheet having adhesive about the perimeter of three sides of said gauze pad and having an unadhered marginal area on the fourth side of said gauze pad to allow said wound dressing to be applied to the wound so that the unadhered marginal area of the outer sheet provides a flutter valve to permit the flow of undesired fluids such as air and blood out of the wound, for example, during expiration but preventing the in-flow of fluids into the wound during inspiration.