Eleazar Lipsky (1911- February 14, 1993) was a prosecutor, lawyer, novelist and playwright born in the Bronx, New York, USA. He wrote the novels that formed the basis of two very successful films, Kiss of Death (based on a 100-page manuscript) and The People Against O'Hara (based on his detective novel). Other novels include Lincoln McKeever (1953), The Devil's Daughter (1969), and The Scientists (1959), a Book-of-the-Month Club selection.

Lipsky, who practiced law until three weeks before his death, was an assistant district attorney for Manhattan in the 1940's and later had a diversified law practice in Manhattan and served as legal counsel to the Mystery Writers of America. Lipsky was active in many Jewish organizations.