William H. "Ducky" Hemp (December 27, 1862 – March 3, 1923) was a professional baseball player whose career spanned seven seasons.

Over his major league career, Hemp compiled a batting average of .214 with 25 hits, 2 doubles, 2 triples, 5 RBIs, and 4 stolen bases.

In 1 game with the Colonels, Hemp got 1 hit, 1 run, 1 double, and 1 base on balls in 4 plate appearances.

Hemp played 21 games with the Alleghenys, and batted .235 with 19 hits, 2 doubles, 4 RBIs, and 3 stolen bases.

Hemp's final season in professional baseball came in 1892 with the Rock Island-Moline Twins, and the Terre Haute Hottentots, both of the Illinois–Indiana League.