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