William Prescott, Jr. (October 19, 1762, Pepperell, Massachusetts - December 8, 1844, Boston, Massachusetts) was a representative from Massachusetts to the 1814-15 Hartford Convention.
Prescott was the only child of American Revolution leader Colonel William Prescott, who served at Bunker Hill in 1775. William Prescott, Jr., graduated from Harvard in 1783, and then taught at Brooklyn, Connecticut, and later at Beverly, Massachusetts. He passed the bar exam in 1787 after studying law in Beverly with Nathan Dane.
Prescott founded a law practice in Beverly. In 1789, he moved his practice to Salem, Massachusetts, where he became a well-known attorney. He represented Salem for several years in the Massachusetts Legislature. He was elected a state senator by the Federal party for Essex County, first in 1806, and again in 1813. He twice declined a seat on the bench of the Supreme Court of Massachusetts. In 1808 he moved to Boston, and was for several years a member of the Governor's Council.
Prescott was elected as a representative to the 1814 secessionist Hartford Convention. In 1815 he was elected a Fellow of the American Academy of Arts and Sciences. He married Catherine Greene Hickling, a daughter of Thomas Hickling, for many years United States consul at the Azores. Their son William H. Prescott became a well-known historian.