Chaffey High School is a public high school in Ontario, California, United States. It is part of the Chaffey Joint Union High School District and rests on approximately 65 acres (260,000 m2), making it one of the largest high schools by area in California. The school currently serves northern Ontario and southern Rancho Cucamonga.

Victoria Lynn Morgan was the mistress of Alfred S. Bloomingdale, heir to the Bloomingdale's department store fortune. The details of their tumultuous relationship became known after Morgan sued Bloomingdale's estate for palimony in 1982. Morgan was murdered in 1983 by Marvin Pancoast, her roommate and occasional lover who was sentenced to prison.