| Jacob H. Plowman | |
| State Delegate: | Maryland |
| Term Start: | 1884 |
| Term End: | 1888 |
| Birth Date: | 5 September 1836 |
| Birth Place: | Laurel, Maryland, U.S. |
| Death Place: | near Emmorton, Maryland, U.S. |
| Resting Place: | Mount Carmel Church Emmorton, Maryland, U.S. |
| Spouse: | Miss Smith |
| Children: | 1 |
Jacob H. Plowman (September 5, 1836 – October 5, 1897) was an American politician from Maryland. He served as a member of the Maryland House of Delegates, representing Harford County from 1884 to 1888.
Jacob H. Plowman was born on September 5, 1836, in Laurel, Maryland.
Plowman learned the trade of a machinist. He worked for the Baltimore and Ohio Railroad. During the Civil War, Plowman served in the Union Army as a quartermaster's clerk. In 1872, Plowman moved to Harford County to pursue farming. He moved to New York City after the war and remained there until 1868. In 1868, he returned to Laurel to work in the machine and iron foundry business.
Plowman was a Democrat. In 1879, Plowman was elected as county commissioner of Harford County. He was remained in that office until 1883. He served as a member of the Maryland House of Delegates, representing Harford County from 1884 to 1888.
In 1887, Plowman was appointed by Governor Elihu Emory Jackson as commander of the Maryland Oyster Navy. He served in that role until 1891.
Plowman married Miss Smith from Oella, Maryland. They had one daughter, Ida C. He was a member of the Presbyterian Church, as well as the Masons and Odd Fellows.
Plowman died on October 5, 1897, at his home near Emmorton, Maryland. He was buried at Mount Carmel Church in Emmorton.