Louis Agassiz Shaw II (1906–1987) was an American socialite, writer and murderer.
His father was a cousin of Colonel Robert Gould Shaw, noted for leading an African-American regiment in the Union Army during the Civil War.
According to Alex Beam's Gracefully Insane (a history of McLean Hospital, where Shaw spent the last years of his life) Shaw kept a copy of the Social Register next to the telephone and instructed his staff to refuse calls from anyone not listed.
He often rode his horse along a bridle path from his estate, and through the area now known as the Ipswich River Wildlife Sanctuary, in order to reach the Myopia Hunt Club.
He confessed but pleaded not guilty; he was committed to Danvers State Hospital and later McLean, where he lived for 23 years.