Percy Wenrich (January 23, 1880 – March 17, 1952) was a United States composer of ragtime and popular music.
Born in Joplin, Missouri, he left for Chicago in 1901 and moved on to New York City around 1907 to work as a Tin Pan Alley composer, but his music retains a Missouri folk flavor. He composed at least eighteen rags, including "Ashy Africa," "Noodles," "Peaches and Cream" (1905), "Crabapples," and "The Smiler" (1907). His songs include "Wabash Avenue After Dark" and the hits "Put on Your Old Grey Bonnet" (1909, lyrics by Stanley Murphy) and "When You Wore a Tulip and I Wore a Big Red Rose" (1914, lyrics by Jack Mahoney).