Ballast is any dense material used as a weight to provide stability to a vehicle or structure.

It may also refer to:

• Ballast, Coevorden, a village in the northeastern Netherlands
• Ballast Head, a headland on Kangaroo Island, Australia
  • Ballast Head, South Australia, a locality
• Ballast Point (Tampa), a neighborhood in Tampa, Florida, US

• Electrical ballast, used to stabilize the current flow in lamps
• Ballast tractor, a heavy-haulage road vehicle designed to pull or push heavy or exceptionally large loads
• Track ballast, the layer of crushed rock or gravel upon which railway track is laid
• Ballast (film), a 2008 film about the effect of one man's suicide on three people
• Ballast (website), a Canadian news and cultural website
• "Ballast", a 1967 story of The Railway Series book Small Railway Engines

• All pages with titles beginning with Ballast
• All pages with titles containing Ballast