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