Mary Nina Searl (13 October 1883 – 26 February 1955) was an English psychologist and one of the earliest British child psychoanalysts, who came by way of the Brunswick Square Clinic to become a member of the British Psychoanalytical Society. She was analysed by Hanns Sachs. Among her supervisees was John Bowlby while she also helped train D. W. Winnicott and Susan Isaacs.