The Gillig Phantom is a series of buses that was produced by an American manufacturer Gillig Corporation in Hayward, California. The successor to the long-running Gillig Transit Coach model line, the Phantom marked the transition of Gillig from a producer of yellow school buses to that of transit buses. The first transit bus assembled entirely by Gillig, the Phantom was produced exclusively as a high-floor bus.

Gillig is an American designer and manufacturer of buses. The company headquarters, along with its manufacturing operations, is located in Livermore, California. By volume, Gillig is the second-largest transit bus manufacturer in North America. 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.