The Sunday Mercury (1839–1896) (sometimes referred to as the New York Sunday Mercury) was a weekly Sunday newspaper published in New York City that grew to become the highest-circulation weekly newspaper (at least by its own claims) in the United States at its peak. It was known for publishing and popularizing the work of many notable 19th-century writers, including Charles Farrar Browne and Robert Henry Newell, and was the first Eastern paper to publish Mark Twain. It was also the first newspaper to provide regular coverage of baseball, and was popular for the extensive war correspondence from soldiers it published during the Civil War.