Antoninus of Piacenza or Antoninus Placentinus may refer to:

• The Piacenza Pilgrim, an anonymous pilgrim who wrote a travelogue in the 6th century and was erroneously identified as Antoninus of Piacenza.
• Saint Antoninus of Piacenza, patron saint of Piacenza, who is venerated as a martyr of 303 AD.

• Grass dancer
• Grass (drug)
• Grass-eater
• Grass eating men
• Grass-eating men
• Grasseella
• Grasseichthys
• Grasseichthys gabonensis
• Grasse's Shrew
• Grasset
• Grasset (disambiguation)
• Grassett
• Grasset typeface
• Grassfields language
• Grassfire Transform
• Grassflat, Pennsylvania
• Grass frog
• Grass frogs
• Grass Goby
• Grass-green Russula
• Grass-green Tanager
• Grasshof
• Grasshoff
• Grass Holm
• Grasshopper 3d