William K. Jackson was a Scottish curler. He was the Skip of the Royal Caledonian Curling Club team which won the first Olympic Gold medal in curling at the inaugural Winter Olympics in Chamonix, France, in 1924.

William Jackson (March 9, 1759–December 17, 1828) was a figure in the American Revolution, most noteworthy as the secretary to the United States Constitutional Convention. He also served with distinction during the Revolutionary War as a Major in George Washington's General Staff and later served as Washington's personal secretary during his first term as President.

William Jackson (c. fl. 1639-1645) was an English privateer who, based in Guanaja and Roatan http://www.mayaparadise.com/castilloe.htm, was in the service of the Providence Island Company from 1639 until around 1641. During that year, he captured a Spanish slave ship at the port of Trujillo and received a ransom of 8,000 pounds of indigo as well as 2,000 pieces-of-eight and two gold chains. Leaving the Providence Island Company, he sailed to England where he sold sugar and indigo to obtain supplies for another privateering expedition and, upon receiving a three year letter of marque from the Earl of Warwick, he set sail commanding a fleet including such prominent privateers as Samuel Axe, William Rous and Lewis Morris in 1642.