Gillig (formerly Gillig Brothers) is an American designer and manufacturer of buses. The company headquarters, along with its manufacturing operations, is located in Livermore, California (in the East Bay region of the San Francisco Bay Area). By volume, Gillig is the second-largest transit bus manufacturer in North America (behind New Flyer). As of 2013, Gillig had an approximate 31 percent market share of the combined United States and Canadian heavy-duty transit bus manufacturing industry, based on the number of equivalent unit deliveries.