John Hartwell Harrison (February 16, 1909 – January 20, 1984) was an American urologic surgeon, professor, and author. He performed the first human organ removal for transplant to another. This was a pivotal undertaking as a member of the medical team that accomplished the world’s first successful kidney transplant. The team conducted its landmark transplant between identical twins in 1954. Harrison taught surgery at nearby Harvard University, where he also contributed as a textbook editor and produced urological monologues. He died at age 74 of bladder cancer.