The Erie Railroad Piermont Branch was a rail branch line that was formed from the easternmost portion of the original main line of the Erie.

The line began at the Piermont Pier, where steamboats ran to New York City.

After this, it ran northwest to Nanuet, where it connected with what is now the NJ Transit Pascack Valley Line.

The only remnants in this section are a surviving Milepost 8 marker,[2] and a bridge over a creek that carries nothing.

Past Blauvelt, the line has been converted to rail trails: the Joseph B. Clarke Rail Trail from Blauvelt to Sparkill; the Old Erie Path from Sparkill to South Nyack and the Raymond G. Esposito Trail from South Nyack to Nyack.