The Gillig Low Floor is a transit bus manufactured by Gillig since 1997. The second low-floor bus design introduced in the United States, the Low Floor originally served as a second product range for the company alongside the Gillig Phantom. As transit bus operators shifted toward low-floor designs, the Low Floor has replaced the Phantom entirely, becoming the sole vehicle platform offered by the company since 2008.

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.