Plainfield North High School (PNHS) is a four-year public high school located in Plainfield, Illinois, a southwest suburb of Chicago, in the United States. Founded in August 2005, it is one of four high schools in the Plainfield Community Consolidated School District 202. As of October 2021, it serves students who live in northern Plainfield, parts Plainfield, Wheatland, and Na-Au-Say Townships, and a small portion of southern Naperville.

Plainfield is a village in Will and Kendall counties, Illinois, United States. The population was 44,762 at the 2020 census.