Depending on context, the word Penguin may refer to:

• a penguin (a flightless bird)
• the publishing company Penguin Group (USA)
• the British publisher Penguin Books
• the Penguin missile
• Pokey the Penguin, a web comic
• the Pittsburgh Penguins, an ice hockey team
• The Penguin, a villain who is encountered in the Batman comic books.
• a Feynman diagram, e.g. http://feyndiagram.com/examples/penguin.php
• a slang term for nuns, based on the stereotypical black habit with a white wimple
• a brand of caffeinated mints made by Seattle-based ifive brands.
• a brand of chocolate biscuit made by McVitie's.
• Tux, the penguin logo/mascot of the Linux project.
• Pingu, a cartoon penguin.
• the town of Penguin, on the north-west coast of Tasmania, Australia
• The Penguins were a 1950's doo-wop band best known for the top ten hit "Earth Angel"