Major-General William Brattle (April 18, 1706 – October 25, 1776) was an American politician, lawyer, cleric, physician and military officer who served as the Attorney General of Massachusetts from 1736 to 1738. Brattle is best known for his role during the American Revolution, in which he initially aligned himself with the Patriot cause before transferring his allegiances towards the Loyalist camp, which led to the eventual downfall of his fortunes.