William D. McCoy (November 17, 1853 – May 14, 1893) was the United States Ambassador to Liberia from 1892 to 1893.

McCoy was of African ancestry.

[1] McCoy was appointed by President Benjamin Harrison to the position of United States Ambassador to Liberia on January 11, 1892.

The presentation of his credentials occurred on March 28, 1892.

[2] McCoy resided in Indiana.