Marybrook is a rural locality of the City of Busselton in the South West region of Western Australia, located on Geographe Bay.

[2][3] The City of Busselton and the locality of Marybrook are located on the traditional land of the Wardandi (also spelled Wadandi) people of the Noongar nation.

[4][5][6] Marybrook was established as a Group Settlement with the group number 144.

[7] The locality is home to the heritage-listed Marybrook farmhouse, a cottage dating back to the 1870s.

It is thought to have been constructed for John Molloy, who died in 1867.