John Ehret High School is a four-year public high school serving grades 9–12 located in unincorporated Jefferson Parish, Louisiana, United States, near the Marrero census-designated place (it has a Marrero postal address).

Sports at John Ehret High School include: football, soccer, basketball, indoor and outdoor track and field, volleyball, softball, baseball, wrestling, and spirit.

[10] The school's mascot is the Patriot, and its colors are red, white, and blue.

[citation needed] In November 2019, parents of a student with muscular dystrophy filed a lawsuit against the district on the grounds that Ehret High did not accommodate him.

[15][16][17] Historically Delgado Community College held evening classes at Ehret.