William Claflin was an American politician, industrialist, and philanthropist from Massachusetts. He served as the 27th governor of Massachusetts from 1869 to 1872 and as a member of the United States Congress from 1877 to 1881. He also served as chairman of the Republican National Committee from 1868 to 1872, serving as a moderating force between the Radical and moderate wings of the Republican Party. His name is given to Claflin University in South Carolina, a historically black college founded with funding from him and his father.

The governor of the Commonwealth of Massachusetts is the chief executive officer of the government of Massachusetts. The governor is the head of the state cabinet and the commander-in-chief of the commonwealth's military forces.