Northern New Jersey Mensa (NNJM) is a chapter of Mensa, the international society for people who score in the top 2% on IQ tests. The goals of the group are to provide and encourage social and intellectual interaction among members.

Mensa is the largest and oldest high IQ society in the world. It is a non-profit organization open to people who score at the 98th percentile or higher on a standardized, supervised IQ or other approved intelligence test.