Objects:

• Ballast tanks, a device used on ships and submarines and other submersibles to control buoyancy and stability
• Ballast weights, metallic plates used to bring auto racing vehicles up to the minimum mandated weight
• Electrical ballast, used to stabilize the current flow in lamps
• Sailing ballast, ship's ballast, used to weight a ship down
• Track ballast, railway track-bed, on which sleepers and track is laid
• Water ballast carried aboard an aircraft, for example in gliding to increase speed

Places:

• Ballast (Drenthe), a village in Drenthe, Netherlands

Other:

• Ballast (film), a 2008 film about the effect of one man's suicide on three people