Curtis Guild Jr. was an American journalist, soldier, diplomat and politician from Massachusetts. He was the 43rd governor of Massachusetts, serving from 1906 to 1909. Prior to his election as governor, Guild served in the Massachusetts Volunteer Militia, seeing active duty in Cuba during the Spanish–American War. He was publisher of the Boston Commercial Bulletin, a trade publication started by 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.