Clamshell may denote anything resembling the bivalve shell of a clam:
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Scoop stretcher, another name for this patient transport device
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Clamshell design, a form factor used for electronic devices, also known as a "flip" or "flip phone".
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Clamshell (container), a design used for storage and food packaging, usually made of plastic or paperboard.
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Clamshell case, a type of box for storing paper items in archives (may also refer to either of the two uses above - electronics or packaging)
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Gallet Clamshell, the world's first water resistant chronograph wristwatch
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Bucket (machine part)#Clamshell bucket, or clamshell bucket
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Clamshell Alliance, an anti-nuclear organization
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Clamshell Falls, a waterfall in Australia
