Jonathan Williams was an American military officer, engineer, and politician. He served as the first superintendent of the United States Military Academy from 1801 to 1803 and from 1805 to 1812. He served as chief of engineers of the United States Army Corps of Engineers from 1802 to 1803 and from 1805 to 1812. He led the construction of fortifications in New York Harbor from 1807 to 1811, including Castle Williams, the first casemated battery in the United States. He served as a member of the United States House of Representatives for Pennsylvania in 1815 but died before the 14th United States Congress assembled.