William Franklin Traffley (December 21, 1859 – June 23, 1908) was a baseball player.

Traffley was born in Staten Island, New York. When he was 18 years old, in 1878, he played two games for the Chicago White Stockings.

Traffley did not play in professional baseball for another five years, in 1883. He played 30 games that season.

His next three seasons (and his last) were spent with the Baltimore Orioles.

Traffley died in Des Moines, Iowa. His brother, John Traffley, also played professional baseball.

• Baseball-Reference