Look up pen in Wiktionary, the free dictionary.

A pen is a writing instrument which applies ink to a surface, usually paper.

Pen may also refer to:

• Pen (enclosure), enclosure for holding animals
• Pen, an adult female swan
• Gladius (cephalopod), or pen, a hard internal bodypart found in certain cephalopods
• Pen (Jamaican cattle farm), a historic livestock farm on the Island of Jamaica
• Sea pen, an order of Cnidarians in the class Octocorallia

• Jan Pen (1921–2010), Dutch economist
• Luke Pen (1960–2002), Australian biologist and environmental scientist
• Ue-Li Pen (born 1967), Canadian astrophysicist
• Yehuda Pen (1854–1937), Lithuanian Jewish painter and art teacher

• Bullpen, an area at a baseball field where relief pitchers warm up
• Pen, India, a place
• Pen (play), by David Marshall Grant
• "The Pen", an episode of Seinfeld
• Autoinjector pen, a medical device to deliver a dose of a drug
  • Insulin pen
• Olympus Pen, a camera
• Submarine pen, a type of submarine base
• T-Mobile Park#The 'Pen, a spectator area in Seattle
• Pen, a character who is Finn the Human’s debut in the original pilot of Adventure Time
• Short for slave pen, an antebellum American slave jail

• PEN (disambiguation)
• Penn (disambiguation)
• Pens (disambiguation)
• Pen Pen (disambiguation)
• Penitentiary, or prison
• Pen register, or dialed number recorder

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