McNeil High School (commonly known as MHS or McNeil) is a public secondary school in an unincorporated area in both Travis and Williamson counties, near Austin, Texas, United States. serving freshmen, sophomores, juniors, and seniors. The school is part of the Round Rock Independent School District (RRISD), with admission primarily based on the locations of students' homes in the district. Three middle schools feed into McNeil: Cedar Valley, Chisholm Trail, and Deerpark.