Plano East Senior High School is a public secondary school in Plano, Texas, serving grades nine through 12. It is part of the Plano Independent School District. Students at Plano East attended one of two feeder high schools: McMillen or Williams.

Plano is a city in the U.S. state of Texas, where it is the largest city in Collin County. Plano is also one of the principal cities of the Dallas-Fort Worth metropolitan area. With a population of 285,494 at the 2020 census, it is the ninth most-populous city in Texas, and, respectively, the 72nd most populous city in the United States.