A. N. McCallum High School is a public high school in Austin, Texas, United States. McCallum, the second oldest high school in the Austin Independent School District (formerly known as Austin Public Schools prior to desegregation in 1971), opened in 1953 to relieve growth in north and northwest Austin. Named after AISD's first high school superintendent, A.N. McCallum, the school strives to reflect the initiatives and achievements of its namesake.