William Waldo (April 22, 1832 – November 24, 1911) was an American politician and attorney in Oregon.

Born in Missouri, he came to the Oregon Country with his family that included father Daniel Waldo.

[2] For a few years he traveled back and forth from his birth state to what was the Oregon Territory, even attending the University of Missouri at one time.

[3] After returning to Oregon permanently, William Waldo attended Willamette University in Salem.

[3] He then read law from future Oregon governor and Senator La Fayette Grover, passing the bar in 1863.