Ampere, formerly known as The Crescent, is a defunct stop on New Jersey Transit's Montclair-Boonton Line in the city of East Orange, Essex County, New Jersey, United States. A station was first built there in 1890 to service to new Crocker Wheeler plant in the district. The stop was named in honor of André-Marie Ampère, a pioneer in electrodynamics and reconstructed as a new Renaissance Revival station in 1908. Ampere was the second stop on the branch west of Newark Broad Street Station until 1984, when the Roseville Avenue station was closed. In June of that year, the station, along with 42 others, was entered into the National Register of Historic Places. In 1986, after continuous deterioration, New Jersey Transit demolished the westbound shelter built in 1921. The agency discontinued rail service to Ampere on April 7, 1991. The entire station was demolished in 1995.

The Montclair-Boonton Line is a commuter rail line of New Jersey Transit Rail Operations in the United States. It is part of the Hoboken Division. The line is a consolidation of three individual lines: the former Delaware, Lackawanna & Western Railroad's Montclair Branch, which ran from Hoboken Terminal to Bay Street, Montclair. The Erie Railroad's Greenwood Lake Division, a segment from Montclair to Mountain View-Wayne, originally ran from the Jersey City Terminal to Greenwood Lake, NY, and the former Lackawanna Boonton Line ran from Hoboken to Hackettstown, New Jersey.