Louis W. Bierbauer (September 28, 1865 – January 31, 1926) was an American professional baseball player. He was a second baseman in Major League Baseball during the late 1880s and 1890s. Over that period of time, he played for the Philadelphia Athletics of the American Association before joining many other major leaguers in jumping to the Brooklyn Ward's Wonders in the newly formed Players' League for the 1890 season, a league which folded after just one year of play.