John Ehret High School is a four-year public high school serving grades 9–12 located in unincorporated Jefferson Parish, Louisiana, United States, near Marrero. The school, a part of the Jefferson Parish Public Schools, serves several communities. Its service area includes portions of Marrero CDP, Harvey, Estelle, and Woodmere. The school's mascot is the Patriot, and its colors are red, white, and blue. During Hurricane Katrina, the school suffered wind damage to many of its buildings.