William Sargent Ladd (October 10, 1826 – January 6, 1893) was a politician and 
businessman in Oregon. He twice served as Mayor of Portland from March 15, 1854
to April 1,1855 and a second term beginning in 1857. He was a prominent figure in the early development of Portland, and co-founded the first bank in Oregon in 1859. Ladd also built the first brick building in the city of Portland. A portion of his former estate, the Ladd Carriage House, was on the National Register of Historic Places until 2008. Ladd arrived in Portland from his native Vermont on April 8, 1851. Originally a Democrat, he became a Republican in 1864 when he supported Abraham Lincoln’s re-election.

 
The Ladd Carriage House in 1953