William Badger (May 26, 1752 – February 22, 1830) was a master shipbuilder operating in Kittery, Maine, United States who was rumored to have built 100 vessels.

About 1788, Badger established a shipbuilding business with David Colcord and Stilmon Tarleton on the Squamscott River at Newfields, but returned to work with Hackett from 1794 until 1799 as a master carpenter on the USS Crescent and USS Congress.

[2] In 1797, Badger acquired 3 acres (1.3 hectares) on Rising Castle Island from his wife's family.

Hull rehired William Badger in 1813, and the USS Washington, first ship produced at the Portsmouth Naval Shipyard, launched in 1814.

The USS William Badger, a whaling ship acquired by the U.S. Navy during the Civil War, was named after him, an honor reserved for his last vessel built in 1828.