Slater-Marietta is a census-designated place (CDP) in Greenville County, South Carolina, United States, along the North Saluda River. The population was 2,176 at the 2010 census. It is part of the Greenville–Mauldin–Easley Metropolitan Statistical Area.
The area was named after the Slater family, who started Slater Mill in 1927 and built the village around it. Earlier the Slaters had started the first textile mill in America in Rhode Island in 1790, Slater Mill, and owned mills in Massachusetts before moving their operation to South Carolina. In 1934 H. Nelson Slater, the mill founder, built Slater Hall, a community center for the village. In 1946 the Slaters sold the mill to J.P. Stevens & Company, and the J.P. Stevens' Slater Plant went on to produce the main material for the space suits used on the first moon landing in 1969 and space shuttle components as well. In 2016 JPS Composite Materials owned the mill, which was mainly producing fiber glass and sold it to B&W Fiber Glass.
Marietta is located in northern Greenville County at 35°1′45″N 82°29′51″W (35.029244, -82.497410). The CDP consists of two adjoining communities, both unincorporated: Slater and Marietta. Each community has its own post office and ZIP Code.