| Inman Valley South Australia |
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 Glaciated pavement in the Inman River |
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| Postcode: | 5211 |
| Location: | 86 km (53 mi) South of Adelaide |
| LGA: | City of Victor Harbor |
Inman Valley (), is a town south of Adelaide.
Selwyn's Rock
Near the town is Selwyn's Rock, a glaciated pavement in the bed of the Inman River. It was first described by, and named for, Alfred Richard Cecil Selwyn, who was Victorian Government Geologist at the time. Glacial striations on the polished surface indicate glacial movement to the north-west. Boulder clays, tillites, and erratics are also common in the area, which underwent glaciation during the Permian (approximately 270 Ma). The pavement was exposed during the Tertiary when the Inman River eroded the topography to its present-day surface.
