St. Petersburg High School, founded in 1898, is a secondary school in the Pinellas County School District in St. Petersburg, Florida. The school's current building, a historic landmark, was built in 1926. It was designed by Missouri architect William B. Ittner. It was listed on the National Register of Historic Places in 1984. The school was billed as the nation's first million dollar high school. The school previously occupied several other historic locations around St. Petersburg, including a location at Mirror Lake (1919–1926).