The North Atlantic Conference (NAC) is an intercollegiate athletic conference which competes in the National Collegiate Athletic Association (NCAA) Division III. Member schools are primarily small liberal arts colleges in the New England states of Maine, Massachusetts and Vermont, as well as the Mid-Atlantic state of New York.

The conference was founded in 1996 when six colleges agreed to form the North Atlantic Women's Conference. It changed to its current name in the fall of 1999. It currently sponsors a total of 17 men's and women's sports played by teams of the 13 institutions therein.

The 17 different sports that are played in the NAC range from the fall season, throughout the winter, and to the spring season. These sports are played among both men's and women's teams.

In the fall season, there are six sports played. Among these are, men's and women's cross country, field hockey, men's golf, men's and women's soccer, women's tennis, and women's volleyball.

In the winter season there are two sports played, which are men's and women's basketball along with men's and women's swimming and diving.

In the spring time there are four sports both for men's and women's teams. The NAC has men's and women's lacrosse, baseball, softball, men's tennis, and men's and women's outdoor track & field.

On June 9, 2016, Colby–Sawyer announced that it would leave the NAC following the 2017–18 school year to join the Great Northeast Athletic Conference (GNAC).

On May 4, 2017, Castleton announced that it would leave the NAC following the 2017–18 school year to join the Little East Conference (LEC).