There have been no pitchers named Don Smith in MLB but several in the minor leagues.
One pitched in the Dodgers minor league system between 1982-1985, another pitched in the Cubs minor league system between 1964-1967, a third pitched in the Dodgers minor league system in 1951 and 1952 and, in 2010, a Don Smith pitched in the independent Northern League.
Hal Smith - pitcher - died on 1992-09-27.
Greg Smith - pitcher - was born on 1983-12-22.
Jack Smith - pitcher - was born on 1935-11-15.
Hal Smith - pitcher - was born on 1902-06-30.
Billy Smith - pitcher - was born on 1954-09-13.
Dan Smith - minor league pitcher - was born in 1962.
Gene Smith - Negro leagues pitcher - died in 2011.
Gene Smith - Negro leagues pitcher - was born in 1917.
Al Smith - left-handed pitcher - died in 1977.
Al Smith - left-handed pitcher - was born in 1907.
Bill Smith - right-handed pitcher - was born in 1861-04.
Will Smith is a relief pitcher for the Milwaukee Brewers.