Louis E Dieruff High School is a public high school in Allentown, Pennsylvania, that serves students in grades 9 through 12. It is part of the Allentown City School District. There are about 1,800 to 1,900 students at the school, and the student-to-teacher ratio is about 17:1. This helps create a structured but welcoming learning environment. Louis E Dieruff High School has a full academic program that includes Advanced Placement® classes and tests. About 16% of students take AP® classes, and the school also has career-focused and college-preparatory pathways. The school also gives the SAT and ACT tests to help students get ready for college. The student body is very diverse, with about 91% of students being minorities. The school serves a community where all students are poor, which is in line with its mission to make education available to everyone. About 16% of students are good at math and 44% are good at reading/ELA for the 2025–2026 school year. Louis E Dieruff High School is the 497th best high school in Pennsylvania. It is one of three full-service high schools in the district. The school is in a well-established urban neighborhood and is continuing to build on its strengths in diversity, access to academics, and preparing students for future educational opportunities.