For the record label, see Hammermill Records.

A hammermill is a mill whose purpose is to shred or crush aggregate material into smaller pieces by the repeated blows of little hammers. These machines have many sorts of applications in many industries, including:

• Ethanol plants (grains)
• A farm machine, which mills grain into coarse flour to be fed to livestock
• Fluff pulp production
• Fruit juice production
• Grinding used shipping pallets for mulch
• Milling grain
• Sawmills, size reduction of trim scrap and planer shavings into boiler fuel or mulch

• Shredding paper
• Shredding scrap automobiles (see automotive shredder residue)
• Shredding yard and garden waste for composting
• Crushing large rocks
• In waste management