The Brunswick Junction to Narrogin railway line is a partially operational railway line in the South West and Wheatbelt regions of Western Australia, connecting Brunswick Junction via Collie and Bowelling to Narrogin.

This final section of the Brunswick Junction to Narrogin railway was opened on 7 October 1907.

[9] The section of the line still active from Brunswick Junction past Collie to the Premier Coal mine is now leased by Arc Infrastructure while the remainder is designated as "Not in use" by the Public Transport Authority.

The Muja-Centaur Coal Mine Railway Act 1951, assented to on 20 November 1951, authorised the construction of a spur line from Muja, east of Collie, to the Centaur coal mine,[11] while the Collie-Cardiff Railway Act 1951, assented to on 20 December 1951, authorised the construction of an extension of the spur to Collie Cardiff.

[14] At the eastern terminus of the line, the Narrogin railway station, built in 1907, is on the Western Australian State Register of Heritage Places.

The heritage listed installations at Narrogin also include a goods shed, a signal cabin, a foot bridge and a number of associated houses.

[19] At the western terminus, at Brunswick Junction, the site of the former railway station is on the Shire of Harvey's heritage list.