Beekman Winthrop (September 18, 1874 – November 10, 1940) was an American lawyer, government official and banker.

He was born in Orange, New Jersey, and attended Harvard University in Cambridge, Massachusetts, where he received a Bachelor of Arts (A.B.)

A descendant of both John Winthrop, first Governor of Massachusetts, and John Winthrop, the Younger, first Governor of Connecticut, immediately after graduating he became a personal secretary to future president William Howard Taft while Taft was Governor-General of the Philippines.

He was known to be a personal friend of Theodore Roosevelt and was appointed by him in 1904 as Governor and General Commander of Puerto Rico, at age 28.

Winthrop was a proponent of bringing citizenship and locally elected officials to Puerto Rico system of governance.