Madison Country Day School is a nonsectarian, private day school in Dane County, Wisconsin for grades PreK through 12. It is the only non-religious private high school in Dane County, and has an enrollment of around 342 students. The school is accredited by the Independent Schools Association of the Central States (ISACS), and is a member of the National Association of Independent Schools (NAIS). It is an International Baccalaureate (IB) World School, and offers the IB Diploma Program to high school students.