William Henry ("Wee Willie") Dammann (August 9, 1872 – December 6, 1948) was an American left-handed Major League Baseball pitcher. A native of Chicago, he played for three seasons in Major League Baseball, all of them with the Cincinnati Reds. His major league debut was in 1897 and he last appeared in the Majors in 1899. In his three seasons, he went 24–15 in 60 games where, starting 38 games and completing 26 with four shutouts.