The Mountain Valley Conference was a New Jersey high school sports association under the jurisdiction of the New Jersey State Interscholastic Athletic Association (NJSIAA).
In 2005, both North Plainfield High School and Ridge High School left the Mountain Valley Conference to join the Skyland Conference.
In 2006 Cranford High School joined the conference in most, but not all of its sports.
Kent Place School in Summit also recently joined.
The schools in Newark will join the Super Essex Conference (SEC) and the Union County schools will form their own conference for all sports except football.