Washington International School

The Washington International School (abbreviated as WIS; Spanish: Colegio Internacional de Washington; French: École Internationale de Washington) is a private international school in Washington, DC.

Established in 1966, WIS was the first school in the Washington area to offer the International Baccalaureate (IB) program.

The school has two campuses: the primary school (grades PK–5) in Georgetown, and the middle and upper school (grades 6–12) in Cleveland Park. The middle and upper school campus is located on the grounds of Marjorie Merriweather Post's Tregaron Estate.

The Washington International School's upper school was ranked as the 73rd most challenging high school in the country and the most challenging high school in the Washington, D.C., area by the Washington Post's "Ranking America's most challenging high schools" article in 2016. Popular school ranking website Niche listed it as the eighth best private high school in the D.C. area.