Northwestern High School is one of three high schools in Rock Hill, South Carolina, United States. It was opened in 1971 as the city's second high school, replacing Emmett Scott High School, which had been designated for African American students during the era of segregated schools. Along with rival Rock Hill High School, it is one of the 16 largest schools in the state by enrollment, with about 1,791 students in grades 9–12. Northwestern offers the International Baccalaureate diploma. Presidential candidate Barack Obama spoke at Northwestern on October 6, 2007.