Jonathan Evan Fielding (born 1942) is a board-certified physician in both Pediatrics and Preventive Medicine, and the former director and health officer of the Los Angeles County Department of Public Health. At UCLA, he is a Distinguished Professor in the Fielding School of Public Health and a Professor in the David Geffen School of Medicine. He is the founder and co-director of the UCLA Center for Health Advancement in the UCLA Fielding School of Public Health.