Plano Senior High School (commonly Plano, Plano Senior High, or PSHS) is a public secondary school in Plano, Texas, USA, serving students in grades 11–12. The school is part of the Plano Independent School District, with admission based primarily on the locations of students' homes. Plano is a two-time Blue Ribbon School and a Texas Exemplary School. Founded in 1891 as Plano Public School, serving both primary and secondary students, the school was, by the mid-1910s, sending a majority of its graduating students on to college. Plano High School was created in 1952 by separating the primary students into Mendenhall Elementary School. In 1964, Plano High School integrated with the Frederick Douglass School (formerly Plano Colored School), and the integrated football team won the first of the school's seven state championships in 1965.
Plano administers more Advanced Placement tests each year than any other school west of the Mississippi River and all but one school in the United States. Plano's graduating classes are among the largest for high schools in the United States; its Class of 2005, with 1,112 graduates, was the second-largest high school graduating class in the U.S. that year, behind only that of Plano East Senior High School.