Barrabup is a rural locality of the Shire of Nannup in the South West region of Western Australia.

The town was to accommodate the employees of the new Bartman & Son's sawmill in the area and was originally to be named St Johns Brook, but this name was deemed not suitable as it was already in use somewhere else in Australia.

[5] The townsite, in the south-western corner of the locality, is now completely covered by forest and no buildings exist within its boundaries.

In 1915, the siding was renamed once more, now to Cambray, and remained under this name until closed in 1984, along with the rest of the line.

[6][7] Cambray siding is now a campsite on the Munda Biddi Trail, while the remnants of the railway bridge over the St Johns Brook are on the heritage list.