Scott Joplin (November 24, 1868 – April 1, 1917) was an American composer and pianist. Dubbed the "King of Ragtime", he composed more than 40 ragtime pieces, one ragtime ballet (original version of "The Ragtime Dance", 1899/1902), and two operas. One of his first and most popular pieces, the "Maple Leaf Rag", became the genre's first and most influential hit, later being recognized as the quintessential rag. Joplin considered ragtime to be a form of classical music meant to be played in concert halls and largely disdained the performance of ragtime as honky tonk music most common in saloons.

Joplin grew up in a musical family of railway laborers in Texarkana, Texas. During the late 1880s, he traveled the American South as a musician. He went to Chicago for the World's Fair of 1893, which helped make ragtime a national craze by 1897. Joplin moved to Sedalia, Missouri, in 1894 and worked as a piano teacher. He began publishing music in 1895, and his "Maple Leaf Rag" in 1899 brought him fame and a steady income. In 1901, Joplin moved to St. Louis and two years later scored his first opera, A Guest of Honor. It was confiscated—along with his belongings—for non-payment of bills and is now considered lost. In 1907, Joplin moved to New York City to (unsuccessfully) find a producer for a new opera. In 1916, Joplin descended into dementia from neurosyphilis. His 1917 death marks the end of the ragtime era.

Joplin's music was rediscovered and returned to popularity in the early 1970s with the release of a million-selling album recorded by Joshua Rifkin. This was followed by the Academy Award–winning 1973 film The Sting, which featured several of Joplin's compositions. Treemonisha, his second opera, was produced in 1972; and, in 1976, Joplin was awarded a Pulitzer Prize.