Millbridge is a northeastern suburb of Bunbury, Western Australia, adjoining Eaton 9 km from the centre of Bunbury. Its local government area is the Shire of Dardanup.

In 2003, the Geographic Names Committee of the Department of Land Information approved the new locality of Millbridge, formerly part of Eaton in the Shire of Dardanup.

Millbridge Private Estate is being developed by the Ardross Group of Companies . The name "Millbridge" is derived from Millars Creek, which runs through the landholding, "and the numerous existing and future bridges that span the nearby and surrounding waterways" (at present three bridges, two on the Forrest Highway over the Collie River and one over Millars Creek, a third bridge that extended Millbridge Boulevard across Millars Creek, opened in late 2007, the final bridge to be built on Eaton Drive which will connect Australind is set to open in April 2018). The name Millar is believed to derive from either the Millars Karri and Jarrah Company, which milled timber in the district for much of the 20th century, or from a local resident with the surname Millar who fished in the creek.

The suburb of Millbridge is bounded to the west by Eaton Drive, to the south by Illawarra Drive, to the east by the Forrest Highway and to the north by the Collie River.

Millbridge is currently dependent on neighbouring Eaton for shopping, education and recreation, although it is envisaged by the developer that two schools, a neighbourhood shopping centre and commercial precinct will be built. The suburb contains a mix of jarrah, marri, sheoak and banksia woodland as well as wetland areas with flooded gums and paperbarks, which provide habitat to a wide range of waterbirds and mammals.

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