The Drummond County Railway (DCR), or chemin de fer du comté de Drummond, was a Canadian railway active from 1886 to 1899 based in Drummondville, Quebec, Canada.
It was originally a local line for the timber industry. At its maximum expansion, it stretched from Lévis to Saint-Hyacinthe, Quebec. It connected with the Grand Trunk Railway at Saint-Hyacinthe. The DCR was purchased by the Canadian government in 1899 and integrated into the Intercolonial Railway's network. An earlier attempt to lease the company to the government was criticized as paying too much for the company to benefit financial backers of the party in power.
The line's Drummondville station in Drummondville, built in 1904 after the federal government acquired the line, is listed in the Quebec government's Répertoire du patrimoine culturel du Québec.
Currently, the main line is still in operation. It is part of the Canadian National network and is also used by the trains of VIA Rail.