Intermontane is a physiographic adjective formed from the prefix "inter-" (signifying among, between, amid, during, within, mutual, reciprocal) and the adjective "montane" (inhabiting, or growing in mountainous regions, especially cool, moist upland slopes below the timberline).

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The corresponding physiographic noun is intermountain, while the noun intermontane is an ecologic noun meaning among, between, amid, or within "flora and fauna of a montane habitat." As an example, an alpine region would be an intermontane for a species that migrates between a glacial region and a subalpine region.^[specify]

• Intermontane Basin, a wide valley between mountain ranges that is partly filled with alluvium such as New Zealand's Mackenzie Basin.^[1]
• Intermontane Belt, a physiogeological region in the North American Pacific Northwest.
• Intermontane Plateaus, the United States physiographic region of the Intermountain West.
• Intermontane Steppe, a term used mainly in reference to the Sayan Intermontane Steppe.^[2]

In palaeogeography, intermontane may refer to

• Intermontane Islands, an ancient Pacific Ocean chain of volcanic islands of the Intermontane Plate that were active during the Triassic period.
• Intermontane Plate, an ancient oceanic tectonic plate on the west coast of North America about 195 million years ago.
• Intermontane Trench, an ancient oceanic trench of the Triassic period along the west coast of North America in the former Slide Mountain Ocean.