Richard Saltonstall Greenough (April 19, 1819 – 1904) was an American sculptor and younger brother to Neoclassical sculptor Horatio Greenough.
Greenough was born in Boston, Massachusetts, the youngest child of Elizabeth (Bender) and David Greenough (1774–1836). He was educated at the Boston Latin School, entering in 1829. At age 17 he followed his brother in a career in sculpture, and in 1837 left for Italy where he belonged to the second generation of American expatriate artists. Thereafter he divided his time between Europe and America, but spent most of his studio life in Rome. Greenough married Sarah Dana Loring of Boston on September 26, 1846. He was elected a Fellow of the American Academy of Arts and Sciences in 1855. He is buried in the Protestant Cemetery, Rome.