Hanna Segal (1918–2011), born Hanna Poznańska in Łódź, Poland, was a British psychoanalyst. She was analysed by Melanie Klein and became one of the leading exponents of Kleinian theory and technique.
Her analysis of psychotic patients led her to the concept of the symbolic equation, in which a symbol is felt to be the very thing it stands for. She set this against the true symbol, which represents an absent object and is formed through mourning in the depressive position. In A Psycho-Analytical Approach to Aesthetics1 she grounded a psychoanalytic account of art in mourning and reparation. Her Introduction to the Work of Melanie Klein2 (1964) became a standard account of Klein's ideas.
Segal was President of the British Psychoanalytical Society and twice Vice-President of the International Psychoanalytical Association. In her later decades she was among the prime movers of a psychoanalytic movement against nuclear armaments, and she wrote on war, terrorism and the destructive forces in groups.