The Mold and Denbigh Junction Railway was a railway company that built a 16-mile (26 km) railway line in North Wales. It formed a link between the Mold Railway (from Chester) and the Vale of Clwyd Railway towards Rhyl.
The line opened in 1869. Serving a largely rural district, it never attracted much business, and the passenger service was withdrawn in 1962. Ordinary goods traffic ceased not long after, and the line closed completely in 1983.