The Donnellys Crossing Section (later the Donnellys Crossing Branch), also known as the Kaihu Valley Railway or Kaihu Branch, was a railway line in Northland, New Zealand. Initially an isolated line of 35.91 kilometres (22.31 mi), it became a branch line when the Dargaville Branch was opened and connected it with the North Auckland Line and the rest of the national rail network in 1943. The branch was closed in 1959.