Hanna Segal (born Hanna Poznanska; 20 August 1918 – 5 July 2011) was a British psychoanalyst of Polish descent and a follower of Melanie Klein.
She was president of the British Psychoanalytical Society, vice-president of the International Psychoanalytical Association, and was appointed to the Freud Memorial Chair at University College, London (UCL) in 1987.
James Grotstein considered that "Received wisdom suggests that she is the doyen of "classical" Kleinian thinking and technique." Sue Lawley described her as "one of the most distinguished psychological theorists of our time,"