Pen (disambiguation)
- Adventure Time
- Autoinjector
- Battle for Dream Island season 1
- Bullpen
- Finn the Human
- Gladius (cephalopod)
- Insulin pen
- Jan Pen
- Luke Pen
- Olympus Pen
- PEN (disambiguation)
- Pen (Jamaican cattle farm)
- Pen (enclosure)
- Pen (play)
- Pen Pen (disambiguation)
- Pen register
- Pen, India
- Penn (disambiguation)
- Pens (disambiguation)
- Peter Pen
- Sea pen
- Slave markets and slave jails in the United States
- Submarine pen
- T-Mobile Park
- The Pen
- Ue-Li Pen
- Yehuda Pen