John M. Ryan

John Michael Ryan (born 1949) is an American lawyer from New York who served as acting Queens County District Attorney. Born in Brooklyn and raised on Long Island, he attended St. John's University and its law school. Joining the Queens District Attorney's office as an intern in 1972, he worked there before joining the state attorney general's office, where he led the investigation of the Tawana Brawley rape allegations. Shortly after the appointment of Richard Brown in 1991, he returned to Queens, serving in the District Attorney's office for the next 28 years.

In 2019, Brown, who had earlier announced his planned resignation due to health reasons, died, and Ryan, then chief assistant district attorney, was sworn in in an acting capacity. He remained in that position for eight months, until Melinda Katz assumed office, after which he retired.