Ricardo Hector Asch (born 26 October 1947) is an obstetrician, gynecologist, and endocrinologist. He worked with reproductive technology and pioneered gamete intrafallopian transfer (GIFT). In the mid-1990s he was accused of transferring ova harvested from women into other patients without proper consent at the University of California, Irvine's fertility clinic. The Orange County Register's investigations into these practices led to that paper's receiving the 1996 Pulitzer Prize for Investigative Reporting. Asch left the United States one year before a federal indictment was filed. Asch was last reported as living in Mexico in 2011.