Peter Oxenbridge Thacher (1752–1802) was a Congregationalist minister in Massachusetts in the 18th century. He served as pastor in Malden of the First Church (1770–1784) and in Boston of the Brattle Street Church (1785–1802). He actively supported the American Revolution. He participated in the drafting of the Massachusetts Constitution in 1780. In 1794, he was elected a Fellow of the American Academy of Arts and Sciences. He belonged to the Massachusetts Historical Society and Massachusetts Humane Society. He was educated at Harvard College, 1765–1769. On October 8, 1770, he married Elizabeth Poole (Hawkes); they had ten children.