Frank C. Ringo (October 12, 1860 – April 12, 1889) was a professional baseball player from 1880 to 1888. He played four seasons of Major League Baseball as a catcher for the Philadelphia Quakers (1883–84), Philadelphia Athletics (1884), Detroit Wolverines (1885), Pittsburgh Alleghenys (1885–86), and Kansas City Cowboys (1886). He committed suicide by morphine overdose in April 1889 at age 28. His suicide is the earliest by a major league baseball player to be recorded in the Baseball Almanac.