The Middle Atlantic Conferences (MAC) is an umbrella organization of three athletic conferences that competes in the NCAA's Division III. The 18 member colleges are in the Mid-Atlantic United States. The organization is divided into two main conferences: the MAC Commonwealth and the MAC Freedom. A third conference, named the Middle Atlantic Conference (singular), draws members from both the Commonwealth and Freedom conferences and sponsors sports that only a certain set of members participate in, such as track & field and cross country.