|Full name||William Herd|
|Place of birth||Scotland|
|Playing position||Left half|
|1921–1922||New York Field Club||21||(1)|
|1923–1924||New York Field Club||24||(1)|
|–1929||New York Giants||90||(6)|
* Senior club appearances and goals counted for the domestic league only|
William "Billy" or "Willie" Herd was a Scottish-American soccer left half who earned one cap with the United States men's national soccer team. He also played eight seasons in the American Soccer League. He was born in Scotland.
In 1919, Herd began his professional career with Lochgelly United when it was reconstituted following World War I. At the time, Lochgelly United competed in the Scottish Northern and Central Leagues. In 1921, he moved to the United States where he signed with the New York Field Club of the American Soccer League season. He moved to Paterson F.C. for the 1922–23 season. Paterson won the 1923 National Challenge Cup over St. Louis Scullin Steel. In 1923, he returned to New York F.C. When New York folded following the end of the season, Herd moved to Indiana Flooring for the 1924–25 season. In 1925, he moved to the Brooklyn Wanderers, again spending only one season with the team. In 1926, he moved to the New York Giants, and remained with the Giants until they were expelled by the ASL during the 1928–29 season. He remained with them when they moved to the Eastern Professional Soccer League.