The Macdonald River railway bridge is an heritage-listed railway bridge that carries the Main Northern line across the Macdonald River located in Woolbrook, in the Walcha Shire, New South Wales, Australia. The railway bridge was designed by John Whitton as the Engineer-in-Chief for the New South Wales Government Railways and built during 1882 by J. S. Bennett, with iron work by J. & C. Brettell, Worcester, England. The railway bridge is also known as the Woolbrook rail bridge over the Macdonald River and the Woolbrook Lattice Railway Bridge. The bridge and adjacent infrastructure is owned by RailCorp, an agency of the Government of New South Wales. The bridge was added to the New South Wales State Heritage Register on 2 April 1999.