Onyx Cave
Onyx Cave may refer to several things in the United States:
- Onyx Cave (Arizona), a National Natural Landmark
- Onyx Cave (Arkansas), a small show cave
- Onyx Cave (Kentucky), a show cave
- Great Onyx Cave, Kentucky
- Great Onyx Cave Entrance, Mammoth Cave, Kentucky, listed on the NRHP in Kentucky
- Crystal Onyx Cave, Kentucky
- Onyx Cave (Newburg, Missouri), listed on the NRHP in Missouri
- Onyx Mountain Caverns, Missouri
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