Union School was founded in
Port-au-Prince in 1919 to serve the children of
United States Marine Corps families stationed in Haiti. From 1920 to 1934, the institution, then known as
Colony School—operated on Turgeau Avenue, enrolling approximately 110 students. On June 10, 1934, following the withdrawal of U.S. Marines, was left with fourteen students, and French was added to the curriculum the same year. In 1943, the school reopened near the Champs de Mars and adopted its current name,
Union School, while revising its admissions policy to accept qualified students of all nationalities. In 1954, the school constructed a permanent facility on Harry Truman Boulevard in the Bicentenaire district. The campus later relocated temporarily to Juvénat in 1987 and moved to its current, purpose-built campus in 2001. == Curriculum ==