The Plant System, named after its owner, Henry B. Plant, was a system of railroads and steamboats in the U.S. South, taken over by the Atlantic Coast Line Railroad in 1902. The original line of the system was the Savannah, Florida and Western Railway, running across southern Georgia. The Plant Investment Company was formed in 1882 to lease and buy other railroads and expand the system. Other major lines incorporated into the system include the Savannah and Charleston Railroad and the Brunswick and Western Railroad.

Henry Bradley Plant, was a businessman, entrepreneur, and investor involved with many transportation interests and projects, mostly railroads, in the southeastern United States. He was founder of the Plant System of railroads and steamboats.