| Day Hort MacDowall | |
| Birth Date: | 3 July 1795 |
| Allegiance: |  United Kingdom |
| Branch: | British Army |
| Rank: | Lieutenant General |
Lieutenant-General Day Hort MacDowall DL (3 July 1795 – 14 September 1870) was a British Army officer who served as colonel of the 3rd (the East Kent) Regiment of Foot.
MacDowall was commissioned as an ensign on 15 April 1813[1] and then served as a major in the 44th Regiment of Foot. He became colonel of the 3rd (the East Kent) Regiment of Foot and was promoted to lieutenant-general in 1866. As the 22nd MacDowall of Garthland, MacDowall was also a Scottish laird.[2]