Penetration may refer to:

• Penetration depth of light or any electromagnetic radiation.
• Market penetration or brand penetration, the degree to which a product or service is known and/or used
• Penetrating trauma
• Sexual penetration, a term which may mean
  • sexual intercourse in general or,
  • in some jurisdictions, a criminal charge related to various sexual offences.
• Penetration (firestop), an opening in a wall or floor assembly required to have a fire-resistance rating, for the purpose of accommodating the passage of a mechanical, electrical, or structural penetrant
• Penetration (telecommunications)
• Penetration (warfare)
• Penetration (weapons), the ability to pierce the target's armor or other protection
• In magic, an illusion in which one object appears to pass through another
• In basketball, the ability of a player to drive through the opposing defense
• In roofing, pipes, conduits, HVAC supports passing through the roof.

Penetration (lat. penetrare „eindringen, durchdringen“) steht für:

• Penetration (Militärtechnik), in der Militärtechnik das Eindringen von Projektilen in Panzerungen
• Penetration (Band), eine britische Punkband

Penetration è un gruppo punk rock formato nel 1976, da Pauline Murray (voce), Gary Chaplin (chitarra), Robert Blamire (basso), Gary Stallman (batteria), sciolto nel 1979 e riformato nel 2001.