Peachtree Ridge High School (PRHS) is a public high school in Gwinnett County, in Suwanee, Georgia, United States. It is a part of Gwinnett County Public Schools. It is one of three public schools in the county to use block scheduling, the others being Shiloh High School and the Gwinnett School of Mathematics, Science, and Technology.

Suwanee is a city in Gwinnett County and a part of the Atlanta metropolitan area in the U.S. state of Georgia. As of the 2010 census, the population was 15,355; this had grown to an estimated 20,907 as of 2019.