The Avon Yard to Mullewa railway line is a 429-kilometre (267 mi) long railway line operated by Arc Infrastructure in the Mid West and Wheatbelt regions of Western Australia, connecting the Avon Yard at Northam with Mullewa.

[8] The contract for the construction of this section was awarded to Atkins & Finlayson on 11 July 1910 and the line was officially opened on 22 August 1911, under the name of Goomalling-Wongan Hills Railway.

The line was discussed publicly as the Wongan Hills-Mullewa Railway,[10] and it was officially opened on 5 March 1915.

[2][3] The Perenjori to Dalwallinu section was closed in the late 1990s as the line would have needed an upgrade to be able to accommodate the increase in heavy haulage.

A reopening of the section was discussed to provide a direct access for the local farming and mining industries to Geraldton port.

[20] In 2021, it was estimated that it would cost A$77.59 million to upgrade the Perenjori to Maya section of the railway line to reopen it.

[22] A number of buildings associated with the railway line are listed on the Western Australian State Register of Heritage Places.

The Mullewa railway station with its goods shed and water tank are state heritage listed.