Jacob Samils Haldeman (October 13, 1821 – November 1889) was an American banker, politician and ambassador from Pennsylvania who served as Minister Resident of the United States at Stockholm from 1861 to 1864. He also served as a Democratic-Republican member of the Pennsylvania House of Representatives from 1850 to 1851 and the Pennsylvania Senate for the 12th district from 1853 to 1856.