Eliot Trevor Oakeshott Slater MD (28 August 1904 – 15 May 1983) was a British psychiatrist who was a pioneer in the field of the genetics of mental disorders. He held senior posts at the National Hospital for Nervous Diseases, Queen Square, London, and the Institute of Psychiatry at the Maudsley Hospital. He was the author of some 150 scientific papers and the co-author of several books on psychiatric topics, notably on disputed 'physical methods'. From the mid-50s to his death, he co-edited Clinical Psychiatry, the leading textbook for psychiatric trainees.