Jam can mean:

• The preserved food, see Jam
• A live music jam
• A traffic jam
• The Jam, a new wave band
• Jam, a British TV series by Chris Morris
• Jam 1575, a radio station in Hull, England
• Perforce Jam, a software building tool
• In a printer, a condition where forms have become blocked or wedged in the form's path so the printer cannot operate.
• Jamming is a technique in electronic warfare to limit the effectiveness of an opponent's communications and/or detection equipment.
• Minaret of Jam in Afghanistan, which is on the World Heritage list