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Manjimup is an Australian wine region located along the banks of the Blackwood River, one of the key rivers in the south-western corner of Western Australia.

A Manjimup wine label

Manjimup is bordered on all sides by other viticultural areas – an unusual characteristic in Western Australia. Most of the state's prime vineyards are situated close to the coast, being reliant on the cooling influences of the Indian and Southern (Antarctic) Oceans. The Blackwood Valley, immediately north of Manjimup, is also something of an exception to this rule, relying as it does on gently increased elevation to moderate the hot, dry Western Australian summers. To the south-east lies the cooler Great Southern region (specifically its Frankland River sub-region), and to the south-west Pemberton. There is a clear distinction between the topography and soils of Manjimup and Pemberton, so the vignerons of both regions were widely relieved when they were awarded separate GIs (Geographical Indications) in February 2006.

Although Pinot Noir was once promoted as a candidate for Manjimup's signature variety, the early vintages did not bear the expected results and plantings have now declined in favor of more obvious choices such as Shiraz, Cabernet Sauvignon and Chardonnay. Pinot has, in fact, been more successful in cooler, coastal Pemberton, although even there it has clearly ceded ground to the warmer-climate varieties.

As in Margaret River, the Manjimup climate is moderated by the presence of the Indian and Southern (Antarctic) Oceans, which mark the western and southern boundaries of Western Australia. Being slightly more elevated, however, Manjimup has a more continental climate, with colder winters permitting true vine dormancy and spring rains bringing healthy growth at the start of the growing season. Expansive forests of magnificent karri trees provide some degree of shelter and moderation for the vines, although in doing so they limit the surface area suitable and available for viticulture. The tallest trees had bush fire lookout towers built into them into the 1930s and 1940s and these – and the forests – are a major tourist attraction.

In viticultural terms, red, gravelly loams, created by the erosive activities of the Warren river, are what most clearly distinguishes Manjimup from its neighbors. Underpinning this is an ancient granite bed, similar to that of the Leeuwin-Naturaliste ridge in Margaret River. This is covered by a layer of laterite, rich in iron and aluminum, the oxidation of which is responsible for the ruddy hue of local soils.