• Cracker (food), a thin crisp biscuit or wafer, usually salted or savoury
• Christmas cracker, traditional British Christmas toy or decoration which gives a loud 'crack' when opened
• Atlanta Crackers, an American baseball team from Atlanta Georgia
• Florida cracker, an American pioneer settler of the 19th century in the state of Florida
• Georgia cracker, an American pioneer settler of the 19th century in the state of Georgia
• Cracker butterflies, a genus of butterfly from the Neotropics
• Cracker (pejorative), an abusive or slang term for a white person
• Software cracker, someone who circumvents copy protection in computer software
• a catalytic cracker used in the petrochemical industry, see cracking (chemistry)
• a short length of twisted twine or string attached to the end of a whip to produce a cracking sound
• another name for a firecracker
• a device used to open small compressed gas cartridges such as whipped-cream chargers
• a person who carries out illegal safe cracking
• in computing, cracker may refer to a black hat computer hacker
• password cracking, the process of recovering passwords from data that has been stored in or transmitted by a computer system.

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