Guy is an unincorporated community in Fort Bend County, Texas, United States. It is located on Texas State Highway 36 (SH 36) about 16 miles (26 km) south of Rosenberg, Texas.
The first Anglo settler in the area was Philip F. Ward in 1890. He was followed within the next four years by S. A. Beard, R. V. Board, J. G. and Frank Goth, H. Hoelewyn, R. G. Hughes, Dr. William Lowry, Sr. and Louis Wolf. A large influx of farmers into the area caused the first local school to be opened in 1897. A post office was established the next year and named for Una Guy Rowland, the disabled daughter of the first postmaster, Orr Rowland. The 1900 Galveston Hurricane caused widespread damage. The Galveston, Harrisburg and San Antonio Railway extended a line south through Guy in 1918.The railroad line was located 0.5 miles (0.8 km) southwest of modern SH 36. It branched off the main line near the west side of Rosenberg and went south-southwest to Needville, Texas and then southeast to Guy.By 1923,the settlement boasted a cotton gin, a garage and a general store with a post office.