Asa Bird Gardiner (September 30, 1839 – May 24, 1919) was a controversial American soldier, attorney, and district attorney for New York County (a.k.a. the Borough of Manhattan) from 1898 to 1900. He received the Medal of Honor for his service in the American Civil War in 1872 but it was rescinded in 1917 when supporting documentation was not found. As a Judge Advocate in the United States Army, he prosecuted the case of Johnson Chesnut Whittaker, a black cadet at West Point.