John Munro Woolsey (January 3, 1877 – May 4, 1945) was a United States federal judge in New York City, known "for his brilliant and poignantly phrased decisions", including several important precedents in First Amendment jurisprudence.
Born in Aiken, South Carolina to William Walton Woolsey and Katherine Buckingham Convers Woolsey, Woolsey attended private school in Englewood, New Jersey and Phillips Academy. Woolsey was a descendant of George (Joris) Woolsey, one of the earliest settlers of New Amsterdam, and Thomas Cornell (settler). His half-sister, Gamel Woolsey, was a noted poet and novelist.
Woolsey received an A.B. from Yale University in 1898. He was awarded an LL.B. from Columbia Law School in 1901, where he was a founder of the Columbia Law Review.