Penicillin is a group of antibiotic medicines.
Penicillin may also refer to:
- Penicillin (band), a Japanese visual kei/alternative rock band
- Penicillin (cocktail), a cocktail based on whiskey, ginger, and lemon
- Penicillin (counter-artillery system), a Russian military sensor system
- "Penicillin (It Doesn't Mean Much)", a song by The Velvet Teen from Elysium, 2004
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