In physics, Vacuum can refer to:

• Vacuum, the absence of matter.
• Vacuum state in quantum mechanics.
• Suction.
• Free space, a concept of electromagnetic theory, corresponding to a theoretical "perfect vacuum".

Vacuum, in different contexts, can also refer to:

• Vacuum Chronometer Corp., a watch, whose very precise automatic movement is fully protecte by vacuum, thus stabilising its movement for long time reliable precision
• Vacuum cleaner, a home appliance.
• Vacuum (band), a musical group from Sweden.
• Manifold vacuum, also called an engine vacuum.
• Power vacuum, a political situation.