The Waukesha S.T.E.M. Academy (WSA) is a charter school in Waukesha, Wisconsin, in the Waukesha School District. It was opened in 2009, and multi-age learning groups were introduced in 2013.
The school has two campuses: the Elementary Campus (K-5) and the Saratoga Campus (6-8) (). Its emphasis is on a STEM curriculum (science, technology, engineering, and mathematics).