Jacob L. Martin (died August 26, 1848) was an American diplomat.
[1] He held the post of Chief Clerk of the U.S. State Department from July 16, 1840, to March 5, 1841.
[3] Martin, a Protestant, was chosen over a few candidates who were openly friendly to Vatican.
He reached Rome on August 2, 1848, but hesitated to enter the city owing to continuing revolution.
[4] Martin presented his credentials to the Holy See on August 19, 1848, but died seven days later[5] and was buried in the city's Protestant Cemetery.