The Flemington Branch was a railroad line in Hunterdon County, New Jersey.

It connected the borough of Flemington, New Jersey, with the Lehigh Valley's main line.

The Lehigh Valley had contemplated building a branch to Flemington since 1876, but work did not begin until 1883.

The Lehigh Valley considered but did not extend the branch to Stockton, New Jersey, on the Delaware River.

[6] The Flemington Branch was one of several dozen lines abandoned by Conrail in the wake of the Staggers Rail Act and Northeast Rail Service Act of 1981, which deregulated many aspects of the railroad industry in the United States.