William Charles Monbouquette (August 11, 1936 – January 25, 2015) was an American professional baseball pitcher. He played in Major League Baseball (MLB) for the Boston Red Sox (1958–1965), Detroit Tigers (1966–1967), New York Yankees (1967–1968), and the San Francisco Giants (1968). He was born in Medford, Massachusetts.
Monbouquette died on January 25, 2015 in Gloucester, Massachusetts, aged 78.