Haley Ishimatsu (born September 10, 1992 in Bellflower, California) is an American platform diver.
Ishimatsu is a fourth-generation Japanese American. Her older sister Victoria "Tory" Ishimatsu is also a competitive diver, and tried out for the 2008 Summer Olympic Games at the U.S. trials with Haley. At the 2008 Kaiser Permanente National Diving Championships, the elder Ishimatsu placed fourth in both the One-meter Springboard and the Synchronized Springboard Final. Ishimatsu signed a letter of intent to compete collegiality at Duke University beginning in the 2010 season. She has now transferred to the University of Southern California where she started attending fall of 2012.