William S. Greenberg (born December 2, 1942) is an American lawyer who serves as a judge of the United States Court of Appeals for Veterans Claims.

[2] He served in the United States Army Reserve for 27 years, rising to the rank of Brigadier General.

He also served as a member of the New Jersey Supreme Court Committee on the Admission of Foreign Attorneys.

He established and chaired the New Jersey State Bar Association (public service/pro bono) program of military legal assistance for members of the Reserve Components called to active duty after September 11, 2001.

On July 26, 2011, Greenberg was awarded the Secretary of Defense Medal for Outstanding Public Service, the second highest civilian award in the Defense Department, at a public ceremony in the Pentagon, and completed his term in August 2011.