Judge Richard A. Posner (b. 1939) is currently a judge on the United States Court of Appeals for the Seventh Circuit. He is a major voice in the "law and economics" movement, which he helped start while a professor at the University of Chicago Law School.

Posner attended Yale College and Harvard Law School, thereafter clerking for Justice William J. Brennan of the United States Supreme Court during the 1962-1963 term. He joined the faculty of the University of Chicago Law School in 1969, where he remains a senior lecturer. President Ronald Reagan appointed Posner to the Seventh Circuit in 1981.