John McDonald (May 24, 1837 – January 30, 1917) was an American soldier and politician.
Born in Dingle, County Kerry, Ireland, McDonald attended local schools. He immigrated to the United States and enlisted in the United States Army at Boston, Massachusetts, in 1857. He joined his regiment in Arizona, and served in the Cavalry Corps of the Army of the Potomac throughout the American Civil War. After the war, McDonald was ordered to the West, where he again took part in several campaigns against hostile Native Americans. He retired as a captain of Cavalry on July 1, 1868 for disabilities incurred in the line of service
After his retirement from the military, McDonald settled in Maryland and was elected as a Republican to the Maryland House of Delegates in 1881. He was later elected to the Fifty-fifth Congress, and served from March 4, 1897 to March 3, 1899. He engaged in agricultural pursuits near Potomac, Maryland, and died in Rockville, Maryland. He is interred in Union Cemetery.
- John McDonald (Maryland politician) at the Biographical Directory of the United States Congress Retrieved on 2008-11-01
! colspan="3" style="background: #cccccc" | United States House of Representatives
|- style="text-align: center;"
|width="30%" align="center" rowspan="1"|Preceded by
George Louis Wellington |width="40%" style="text-align: center;" rowspan="1"|Representative of the 6th Congressional District of Maryland
1897—1899 |width="30%" align="center" rowspan="1"| Succeeded by
George Alexander Pearre |- |}