A headgear accessory attachment apparatus includes a band having an adjustable size for fitting about a circumference of various outdoor sports helmets such as bicycle, skateboarding, snow sport, mountaineering, equestrian helmets, military helmets, and hard hats used in material moving, dock loading, and airport baggage handling. The accessory attachment apparatus provides the wearer an easy means to attach headgear accessories such as headlamps, helmet cameras, rear lights, goggles, visors, brims, and decorative embellishments to the helmet. The accessories may be permanently or temporarily secured to the accessory apparatus. In one headgear accessory attachment apparatus, the band includes a stop surface that opposes a bottom surface of the headgear when the apparatus is affixed to the headgear such that the apparatus is prevented from becoming dislodged during use.