Stanley Marshall Rinehart Jr. (1897–1969) was an American book publisher. He was the son of mystery writer Mary Roberts Rinehart, the brother of publisher Frederick Roberts Rinehart, and the brother of producer and playwright Alan Rinehart.
Rinehart was born on August 18, 1897 in Allegheny, Pennsylvania (which has since merged with Pittsburgh, Pennsylvania). After studying at Shady Side Academy in Pittsburgh, he graduated from the Morristown School in Morristown, New Jersey (now Morristown-Beard School) in 1915. Rinehart then studied at Harvard University before leaving school to serve in the U.S. Army during World War I. During his days at Harvard, Rinehart served on the Editorial Board of the Harvard Lampoon, a humor magazine. Following his war service, Rinehart began a career in publishing as a worker in the advertising department at George H. Doran. After taking on the position of advertising manager, he also served as the company's secretary and as a member of its Board of Trustees.
In 1929, Rinehart co-founded the publishing house Farrar & Rinehart with Frederick Rinehart and John C. Farrar. Rinehart then served as the company's founding president. In just a few weeks, Rinehart and his associates began announcing a slate of upcoming publications:
Under the leadership of Rinehart and his colleagues, Farrar & Rinehart achieved notoriety for publishing the works of Hervey Allen, Katherine Brush, and Mary Roberts Rinehart. The company also achieved recognition as one of the first publishers of dollar fiction. After Farrah & Rinehart acquired the Cosmopolitan Book Corporation from William Randolph Hearst in 1931, the company began to publish college textbooks. In 1943, Publishers Weekly awarded Farrah & Rinehart its first Carey–Thomas Award for publication of the Rivers of America Series by literary figures.