The Profits of Religion: An Essay in Economic Interpretation is a nonfiction book, first published in 1917, by the American novelist and muck-raking journalist Upton Sinclair. It is a snapshot of the religious movements in the U.S. before its entry into World War I.

Upton Beall Sinclair Jr. was an American writer, muckraker, political activist and the 1934 Democratic Party nominee for governor of California. He wrote nearly 100 books and other works in several genres. Sinclair's work was well known and popular in the first half of the 20th century, and he won the Pulitzer Prize for Fiction in 1943.