Windmill Hill Cutting () is a large cutting on the dual gauge railway east of Toodyay in Western Australia. The cutting was constructed between 1963 and 1964 for the Eastern Railway route through the Avon Valley. The route became operational in February 1966.
A lookout and picnic area were developed at the site giving tourists a view from the top of the cutting. A plaque at the lookout reads:
Windmill Hill Cutting
Deepest cutting on the standard gauge railway and one of the deepest in Australia. The geological nature of the site required special treatment to consolidate the slopes. Constructed 1963-1964.
Depth (max): 34 metres
Length: 510 metres
Width: 20 – 75 metres
Height above sea level 151 metres