Joseph Pembroke Thom (March 13, 1828 – August 21, 1899) was an American military officer and politician.

[2][4] Thom served on the staff of Taliferro during John Brown's raid on Harpers Ferry.

He was wounded from a minié ball at the First Battle of Kernstown, but was protected by a copy of the Bible in his chest pocket.

His physician ordered him to Bermuda and Thom ran the blockade from Charleston, South Carolina.

Thom then moved to Canada and, in 1863, he was ordered to Italy to await completion of cruisers being built in France for the Confederacy.

[1][2] Thom was appointed to the board of management of a state hospital for children in Owings Mills, Maryland, that he failed to pass legislation for while delegate.

His son Pembroke Lea Thom followed him as delegate and passed legislation for the establishment of the hospital.

Thom, alongside Dr. William T. Howard and Dr. H. P. C. Wilson, founded The Hospital for Women of Maryland.

They had two sons, Hunt R. Mayo and J. Pembroke Jr.[1] Thom owned a farm near Catonsville, Maryland, where he raised Jersey cattle.